Azure Serverless Computing Cookbook - Second Edition

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If you think that the key has been compromised, then you can regenerate it at any time by clicking on the Renew button. Note that when you renew a key, all the applications that access the function would no longer work and would give a 401 Unauthorized status code error.

You can delete or revoke the key if it is no longer used in any of the applications.

Here's a table with some more guidance on keys:

Key type	When should I use it?	Is it revocable (can it be deleted)?	Renewable?	Comments
Master key	When the Authorization level is Admin	No	Yes	You can use a master key for any function within the function app irrespective of the authorization level configured.
Host key	When the Authorization level ...