pnp · milanholemans · Dec 30, 2025
diff --git a/docs/docs/cmd/teams/chat/chat-message-send.mdx b/docs/docs/cmd/teams/chat/chat-message-send.mdx
@@ -1,3 +1,5 @@
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
 import Global from '/docs/cmd/_global.mdx';
 
 # teams chat message send
@@ -24,6 +26,9 @@ m365 teams chat message send [options]
 
 `-m, --message <message>`
 : The message to send
+
+`--contentType [contentType]`
+: The content type of the message. Allowed values are `text` and `html`. Default is `text`.
 ```
 
 <Global />
@@ -32,12 +37,29 @@ m365 teams chat message send [options]
 
 A new chat conversation will be created if no existing conversation with the participants specified with emails is found.
 
+## Permissions
+
+<Tabs>
+  <TabItem value="Delegated">
+
+  | Resource        | Permissions                 |
+  |-----------------|-----------------------------|
+  | Microsoft Graph | Chat.Read, ChatMessage.Send |
+
+  </TabItem>
+  <TabItem value="Application">
+
+  This command does not support application permissions.
+
+  </TabItem>
+</Tabs>
+
 ## Examples
 
 Send a message to a Microsoft Teams chat conversation by id
 
 ```sh
-m365 teams chat message send --chatId 19:2da4c29f6d7041eca70b638b43d45437@thread.v2 --message "Welcome to Teams"
+m365 teams chat message send --chatId 19:2da4c29f6d7041eca70b638b43d45437@thread.v2 --message "<b>Welcome</b> to Teams" --contentType html
 ```
 
 Send a message to a single person

diff --git a/src/m365/teams/commands/chat/chat-message-send.spec.ts b/src/m365/teams/commands/chat/chat-message-send.spec.ts
@@ -48,6 +48,8 @@ describe(commands.CHAT_MESSAGE_SEND, () => {
     auth.connection.active = true;
     sinon.stub(accessToken, 'assertAccessTokenType').returns();
     commandInfo = cli.getCommandInfo(command);
+
+    sinon.stub(cli, 'getSettingWithDefaultValue').callsFake((settingName, defaultValue) => settingName === settingsNames.prompt ? false : defaultValue);
   });
 
   beforeEach(() => {
@@ -101,7 +103,6 @@ describe(commands.CHAT_MESSAGE_SEND, () => {
       request.get,
       request.post,
       accessToken.getUserNameFromAccessToken,
-      cli.getSettingWithDefaultValue,
       cli.handleMultipleResultsFound
     ]);
   });
@@ -120,14 +121,6 @@ describe(commands.CHAT_MESSAGE_SEND, () => {
   });
 
   it('fails validation if chatId and chatName and userEmails are not specified', async () => {
-    sinon.stub(cli, 'getSettingWithDefaultValue').callsFake((settingName, defaultValue) => {
-      if (settingName === settingsNames.prompt) {
-        return false;
-      }
-
-      return defaultValue;
-    });
-
     const actual = await command.validate({
       options: {
         message: "Hello World"
@@ -187,14 +180,6 @@ describe(commands.CHAT_MESSAGE_SEND, () => {
   });
 
   it('fails validation if chatId and chatName properties are both defined', async () => {
-    sinon.stub(cli, 'getSettingWithDefaultValue').callsFake((settingName, defaultValue) => {
-      if (settingName === settingsNames.prompt) {
-        return false;
-      }
-
-      return defaultValue;
-    });
-
     const actual = await command.validate({
       options: {
         chatId: '19:8b081ef6-4792-4def-b2c9-c363a1bf41d5_5031bb31-22c0-4f6f-9f73-91d34ab2b32d',
@@ -206,14 +191,6 @@ describe(commands.CHAT_MESSAGE_SEND, () => {
   });
 
   it('fails validation if chatId and userEmails properties are both defined', async () => {
-    sinon.stub(cli, 'getSettingWithDefaultValue').callsFake((settingName, defaultValue) => {
-      if (settingName === settingsNames.prompt) {
-        return false;
-      }
-
-      return defaultValue;
-    });
-
     const actual = await command.validate({
       options: {
         chatId: '19:8b081ef6-4792-4def-b2c9-c363a1bf41d5_5031bb31-22c0-4f6f-9f73-91d34ab2b32d',
@@ -225,14 +202,6 @@ describe(commands.CHAT_MESSAGE_SEND, () => {
   });
 
   it('fails validation if chatName and userEmails properties are both defined', async () => {
-    sinon.stub(cli, 'getSettingWithDefaultValue').callsFake((settingName, defaultValue) => {
-      if (settingName === settingsNames.prompt) {
-        return false;
-      }
-
-      return defaultValue;
-    });
-
     const actual = await command.validate({
       options: {
         chatName: 'test',
@@ -244,14 +213,6 @@ describe(commands.CHAT_MESSAGE_SEND, () => {
   });
 
   it('fails validation if all three mutually exclusive properties are defined', async () => {
-    sinon.stub(cli, 'getSettingWithDefaultValue').callsFake((settingName, defaultValue) => {
-      if (settingName === settingsNames.prompt) {
-        return false;
-      }
-
-      return defaultValue;
-    });
-
     const actual = await command.validate({
       options: {
         chatId: '19:8b081ef6-4792-4def-b2c9-c363a1bf41d5_5031bb31-22c0-4f6f-9f73-91d34ab2b32d',
@@ -264,17 +225,20 @@ describe(commands.CHAT_MESSAGE_SEND, () => {
   });
 
   it('fails validation if message is not specified', async () => {
-    sinon.stub(cli, 'getSettingWithDefaultValue').callsFake((settingName, defaultValue) => {
-      if (settingName === settingsNames.prompt) {
-        return false;
+    const actual = await command.validate({
+      options: {
+        chatId: "19:8b081ef6-4792-4def-b2c9-c363a1bf41d5_5031bb31-22c0-4f6f-9f73-91d34ab2b32d@unq.gbl.spaces"
       }
+    }, commandInfo);
+    assert.notStrictEqual(actual, true);
+  });
 
-      return defaultValue;
-    });
-
+  it('fails validation if contentType is not valid', async () => {
     const actual = await command.validate({
       options: {
-        chatId: "19:8b081ef6-4792-4def-b2c9-c363a1bf41d5_5031bb31-22c0-4f6f-9f73-91d34ab2b32d@unq.gbl.spaces"
+        chatId: '19:8b081ef6-4792-4def-b2c9-c363a1bf41d5_5031bb31-22c0-4f6f-9f73-91d34ab2b32d@unq.gbl.spaces',
+        contentType: 'Invalid',
+        message: 'Hello World'
       }
     }, commandInfo);
     assert.notStrictEqual(actual, true);
@@ -324,7 +288,19 @@ describe(commands.CHAT_MESSAGE_SEND, () => {
     await command.action(logger, {
       options: {
         chatId: "19:82fe7758-5bb3-4f0d-a43f-e555fd399c6f_8c0a1a67-50ce-4114-bb6c-da9c5dbcf6ca@unq.gbl.spaces",
-        message: "Hello World"
+        message: "Hello World",
+        contentType: "text"
+      }
+    });
+    assert(loggerLogSpy.notCalled);
+  });
+
+  it('sends chat message using chatId and contentType', async () => {
+    await command.action(logger, {
+      options: {
+        chatId: "19:82fe7758-5bb3-4f0d-a43f-e555fd399c6f_8c0a1a67-50ce-4114-bb6c-da9c5dbcf6ca@unq.gbl.spaces",
+        message: "<p>Hello World</p>",
+        contentType: "html"
       }
     });
     assert(loggerLogSpy.notCalled);
@@ -404,14 +380,6 @@ describe(commands.CHAT_MESSAGE_SEND, () => {
   });
 
   it('fails sending message with multiple found chat conversations by chatName', async () => {
-    sinon.stub(cli, 'getSettingWithDefaultValue').callsFake((settingName, defaultValue) => {
-      if (settingName === settingsNames.prompt) {
-        return false;
-      }
-
-      return defaultValue;
-    });
-
     await assert.rejects(command.action(logger, {
       options: {
         chatName: "Just a conversation with same name",
@@ -433,14 +401,6 @@ describe(commands.CHAT_MESSAGE_SEND, () => {
   });
 
   it('fails sending message with multiple found chat conversations by userEmails', async () => {
-    sinon.stub(cli, 'getSettingWithDefaultValue').callsFake((settingName, defaultValue) => {
-      if (settingName === settingsNames.prompt) {
-        return false;
-      }
-
-      return defaultValue;
-    });
-
     await assert.rejects(command.action(logger, {
       options: {
         userEmails: "AlexW@M365x214355.onmicrosoft.com,NateG@M365x214355.onmicrosoft.com",
@@ -503,6 +463,57 @@ describe(commands.CHAT_MESSAGE_SEND, () => {
     assert(loggerLogSpy.notCalled);
   });
 
+  it('sends chat messages using HTML content type', async () => {
+    sinonUtil.restore(request.post);
+    const postStub = sinon.stub(request, 'post').callsFake(async (opts) => {
+      if (opts.url === `https://graph.microsoft.com/v1.0/chats/19:82fe7758-5bb3-4f0d-a43f-e555fd399c6f_8c0a1a67-50ce-4114-bb6c-da9c5dbcf6ca@unq.gbl.spaces/messages`) {
+        return messageSentResponse;
+      }
+
+      throw 'Invalid request';
+    });
+
+    await command.action(logger, {
+      options: {
+        chatId: '19:82fe7758-5bb3-4f0d-a43f-e555fd399c6f_8c0a1a67-50ce-4114-bb6c-da9c5dbcf6ca@unq.gbl.spaces',
+        message: '<b>Hello World</b>',
+        contentType: 'html'
+      }
+    });
+
+    assert.deepStrictEqual(postStub.firstCall.args[0].data, {
+      body: {
+        contentType: 'html',
+        content: '<b>Hello World</b>'
+      }
+    });
+  });
+
+  it('sends chat messages using text content type when not specified', async () => {
+    sinonUtil.restore(request.post);
+    const postStub = sinon.stub(request, 'post').callsFake(async (opts) => {
+      if (opts.url === `https://graph.microsoft.com/v1.0/chats/19:82fe7758-5bb3-4f0d-a43f-e555fd399c6f_8c0a1a67-50ce-4114-bb6c-da9c5dbcf6ca@unq.gbl.spaces/messages`) {
+        return messageSentResponse;
+      }
+
+      throw 'Invalid request';
+    });
+
+    await command.action(logger, {
+      options: {
+        chatId: '19:82fe7758-5bb3-4f0d-a43f-e555fd399c6f_8c0a1a67-50ce-4114-bb6c-da9c5dbcf6ca@unq.gbl.spaces',
+        message: 'Hello World'
+      }
+    });
+
+    assert.deepStrictEqual(postStub.firstCall.args[0].data, {
+      body: {
+        contentType: 'text',
+        content: 'Hello World'
+      }
+    });
+  });
+
   // The following test is used to test the retry mechanism in use because of an intermittent Graph issue.
   it('fails sending chat message when maximum of 3 retries with 404 intermittent failure have occurred', async () => {
     sinonUtil.restore(request.post);

diff --git a/src/m365/teams/commands/chat/chat-message-send.ts b/src/m365/teams/commands/chat/chat-message-send.ts
@@ -20,9 +20,12 @@ interface Options extends GlobalOptions {
   userEmails?: string;
   chatName?: string;
   message: string;
+  contentType?: string;
 }
 
 class TeamsChatMessageSendCommand extends GraphDelegatedCommand {
+  private readonly contentTypes = ['text', 'html'];
+
   public get name(): string {
     return commands.CHAT_MESSAGE_SEND;
   }
@@ -45,7 +48,8 @@ class TeamsChatMessageSendCommand extends GraphDelegatedCommand {
       Object.assign(this.telemetryProperties, {
         chatId: typeof args.options.chatId !== 'undefined',
         userEmails: typeof args.options.userEmails !== 'undefined',
-        chatName: typeof args.options.chatName !== 'undefined'
+        chatName: typeof args.options.chatName !== 'undefined',
+        contentType: args.options.contentType ?? 'text'
       });
     });
   }
@@ -63,6 +67,10 @@ class TeamsChatMessageSendCommand extends GraphDelegatedCommand {
       },
       {
         option: '-m, --message <message>'
+      },
+      {
+        option: '--contentType [contentType]',
+        autocomplete: this.contentTypes
       }
     );
   }
@@ -81,6 +89,10 @@ class TeamsChatMessageSendCommand extends GraphDelegatedCommand {
           }
         }
 
+        if (args.options.contentType && !this.contentTypes.includes(args.options.contentType)) {
+          return `'${args.options.contentType}' is not a valid value for option contentType. Allowed values are ${this.contentTypes.join(', ')}.`;
+        }
+
         return true;
       }
     );
@@ -93,7 +105,7 @@ class TeamsChatMessageSendCommand extends GraphDelegatedCommand {
   public async commandAction(logger: Logger, args: CommandArgs): Promise<void> {
     try {
       const chatId = await this.getChatId(logger, args);
-      await this.sendChatMessage(chatId as string, args);
+      await this.sendChatMessage(chatId, args);
     }
     catch (err: any) {
       this.handleRejectedODataJsonPromise(err);
@@ -112,7 +124,7 @@ class TeamsChatMessageSendCommand extends GraphDelegatedCommand {
 
   private async ensureChatIdByUserEmails(userEmailsOption: string): Promise<string> {
     const userEmails = userEmailsOption.trim().toLowerCase().split(',').filter(e => e && e !== '');
-    const currentUserEmail = accessToken.getUserNameFromAccessToken(auth.connection.accessTokens[this.resource].accessToken).toLowerCase();
+    const currentUserEmail = accessToken.getUserNameFromAccessToken(auth.connection.accessTokens[auth.defaultResource].accessToken).toLowerCase();
     const existingChats = await chatUtil.findExistingChatsByParticipants([currentUserEmail, ...userEmails]);
 
     if (!existingChats || existingChats.length === 0) {
@@ -189,11 +201,12 @@ class TeamsChatMessageSendCommand extends GraphDelegatedCommand {
       url: `${this.resource}/v1.0/chats/${chatId}/messages`,
       headers: {
         accept: 'application/json;odata.metadata=none',
-        'content-type': 'application/json;odata=nometadata'
+        'content-type': 'application/json'
       },
       responseType: 'json',
       data: {
         body: {
+          contentType: args.options.contentType || 'text',
           content: args.options.message
         }
       }

diff --git a/src/m365/teams/commands/chat/chatUtil.ts b/src/m365/teams/commands/chat/chatUtil.ts
@@ -3,10 +3,9 @@ import { formatting } from '../../../../utils/formatting.js';
 import { odata } from '../../../../utils/odata.js';
 
 export const chatUtil = {
-
   /**
    * Finds existing Microsoft Teams chats by participants, using the Microsoft Graph
-   * @param expectedMemberEmails a string array of participant emailaddresses   
+   * @param expectedMemberEmails a string array of participant email addresses
    * @param logger a logger to pipe into the graph request odata helper.
    */
   async findExistingChatsByParticipants(expectedMemberEmails: string[]): Promise<Chat[]> {