An Azure service that provides an event-driven serverless compute platform.
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Updating web app settings
Failed to update web app settings: The data is not valid (Invalid or not allowed environment key name: username
I am not able to locate a definitive list of reserved environment variables but I would say "username" is most likely used by the system thus not letting you use it.
This seems backed by a reported bug in Azure-Samples where they changed Username to DevOps.Username to fix it.