3x3cut0r

I'm using the community version, if you say that this feature is in pro version (I didn't find it in the comparison), I'll buy it right away.

Imho most probably you try Environment.GetEnvironmentVariable("somevariable") somewhere and you don't have that "somevariable" in either local.settings.json when running locally, or in azure configuration when running in Azure. At least that's...