Error calling sync triggers (BadRequest) during func azure functionapp publish

[MartinWickman]

Deploy fails for a function app and I cannot figure out what is wrong. The portal says

"Azure Functions runtime is unreachable"

The reason is because of an ArgumentException being thrown in Startup.cs due to missing configuration values. I found this out by trial and error.

So I would like to know if errors during startup is logged somewhere or if they are just ignored?

PS C:\Users\marti\RiderProjects\ContactService\ContactService> func azure functionapp publish bsl-contactservice-dev
Microsoft (R) Build Engine version 16.8.0+126527ff1 for .NET
Copyright (C) Microsoft Corporation. All rights reserved.

  Determining projects to restore...
  All projects are up-to-date for restore.
  ContactService -> C:\Users\marti\RiderProjects\ContactService\ContactService\bin\publish\ContactService.dll

Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:00:01.73


Getting site publishing info...
Creating archive for current directory...
Uploading 16,07 MB [##############################################################################]
Upload completed successfully.
Deployment completed successfully.
Syncing triggers...
Syncing triggers...
Syncing triggers...
Syncing triggers...
Syncing triggers...
Syncing triggers...
Error calling sync triggers (BadRequest). Request ID = '8d8f5875-e5ed-42f2-bac0-ac2392210e7c'.