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Found the problem....although there is a runtime named `DOTNET|5.0` if you query Azure, it's actually expecting the value `DOTNETCORE|5.0`  which I only discovered when I queried the configuration of a working app service.

setting `linuxFxVersion` to `DOTNETCORE|5.0` fixed the problem.

Usually when I'm not sure what the value of a config needs to be, I set it manually then export the ARM template to see the value it's set in there.