Description

Attempt to deploy new Maui project "maui_app" results in (incorrect/misleading) error message:

The project needs to be deployed before we can debug. Please enable Deploy in the Configuration Manager.

Steps to Reproduce

1. Create new project using Maui .Net App template.
2. Give it a name containing an underscore ("maui_app")
3. Run on Windows Machine

Expected:
Runs and shows Welcome to .NET Multi-platform App UI Home screen.

Actual:
(incorrect/misleading) error message:

The project needs to be deployed before we can debug. Please enable Deploy in the Configuration Manager.

NOTES:

• Deploy is checked.
• Attempts to fix by cleaning project, etc. have no effect.

ROOT CAUSE:

• this line in csproj:
  <ApplicationId>com.companyname.maui_app</ApplicationId>

WORK-AROUND:

• remove underscore(s) from ApplicationID:
  <ApplicationId>com.companyname.mauiapp</ApplicationId>

Link to public reproduction project repository

No response

Version with bug

8.0.61 SR6.1

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

Windows

Affected platform versions

latest Windows 11 stable

Did you find any workaround?

ROOT CAUSE:

• this line in csproj:
  <ApplicationId>com.companyname.maui_app</ApplicationId>

WORK-AROUND:

• remove underscore(s) from ApplicationID:
  <ApplicationId>com.companyname.mauiapp</ApplicationId>

Relevant log output

No response