Describe the bug

When using the CLI to create a Function App on Container App that uses a private Azure Container Registry, if I don’t include --registry-server, --registry-password and --registry-username, the following error message occurs:

Usage error: --registry-server, --registry-password and --registry-username are required together if not using Azure Container Registry

These fields are all required when creating a Function App on Container App that uses a private registry (ACR or other), so a more accurate error message would be to the effect of the following:
Usage error: --registry-server, --registry-password and --registry-username are required together if you are using a private registry with a Function App on Container App

Furthermore, the Help for az functionapp create doesn’t indicate that --registry-server and --registry-username are required for private registries when using Function App on Container App, so it would be helpful to mention this requirement for these fields.

Related command

az functionapp create

Errors

Usage error: --registry-server, --registry-password and --registry-username are required together if not using Azure Container Registry

Issue script & Debug output

az functionapp create --name MyFunctionApp --resource-group MyRG --max-replicas 1 --min-replicas 1 --storage-account MyStorageAccount --environment MyEnv --image MyACR.azurecr.io/azurefunctionsimage:v1.0.0 --registry-username MyACR --registry-password MyACRKey --registry-server MyACR.azurecr.io

Expected behavior

An error message such as the following:

Usage error: --registry-server, --registry-password and --registry-username are required together if you are using a private registry with a Function App on Container App

Environment Summary

azure-cli 2.58.0

core 2.58.0
telemetry 1.1.0

Extensions:
ai-examples 0.2.5
application-insights 0.1.19
connectedk8s 1.3.20
connection 0.1.0
containerapp 0.3.46
customlocation 0.1.3
db-up 0.2.7
k8s-extension 1.4.1
logicapp 0.1.1
ml 2.23.0
spring 1.13.1
ssh 2.0.2
webapp 0.4.0
workerapp 0.1.3

Dependencies:
msal 1.26.0
azure-mgmt-resource 23.1.0b2

Additional context

No response