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.NET 5 Azure Functions issues

The below has been tested with a newly created Azure Functions project targeting .NET Core 3.1 that is then converted to .NET 5 using the steps in this blog post. The project is able to run locally, but attempting to publish it fails. More specifically:

Attempting to run func azure functionapp publish <FunctionAppName> returns the following error:

Your Azure Function App has 'FUNCTIONS_WORKER_RUNTIME' set to 'dotnet' while your local project is set to 'None'.
You can pass --force to update your Azure app with 'None' as a 'FUNCTIONS_WORKER_RUNTIME'

Attempting to run func azure functionapp publish <FunctionAppName> --csharp appears to work (since the following is displayed)

Getting site publishing info...
Creating archive for current directory...
Uploading 84.1 MB [###############################################################################]
Upload completed successfully.
Deployment completed successfully.
Syncing triggers...
Functions in <FunctionAppName>:
    Example - [No Trigger Found]
        Invoke url: <InvokeURL>

When checking the Function app in the portal however:

  • On the "Overview" page: Microsoft.Azure.WebJobs.Script: Did not find functions with language [dotnet].
  • On the "Functions" page, the Function itself is listed but the following error is displayed at the top: Azure Functions runtime is unreachable

Attempting to run func azure functionapp publish <FunctionAppName> --dotnet appears to work (since the following is displayed)

Getting site publishing info...
Creating archive for current directory...
Uploading 84.1 MB [###############################################################################]
Upload completed successfully.
Deployment completed successfully.
Syncing triggers...
Functions in <FunctionAppName>:
    Example - [No Trigger Found]
        Invoke url: <InvokeURL>

I tried running func azure functionapp publish <FunctionAppName> --dotnet-isolated (since the value of FUNCTIONS_WORKER_RUNTIME in local.settings.json is dotnet-isolated, but that generates the following error instead:

Can't determine project language from files. Please use one of [--csharp, --javascript, --typescript, --java, --python, --powershell, --custom]

Attempting to load the invokation URL return a 503 error with the text Function host is not running., but the function host is in an enabled and running state according to the portal.

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