Is it possible to secure an Azure Function within an Azure AD B2C user journey using a function key

Question

I understand how to secure the function using https://learn.microsoft.com/en-us/azure/active-directory-b2c/secure-rest-api but that is overkill for my function as only ADB2C should be calling it.

How do I use a function key to secure it or is it not possible?

Answer 1

You just put the function key in the ServiceURL (as azure function provides), and set the rest api technical profile up for no authentication.