Secure Azure Functions

Occasional Visitor
I’ve read that the access key/authlevel.Function it’s not secure enough way to expose the Azure Functions and most of the guides out there speak about how one can use managed identity to secure the connection to I.e kevault or storage.
But how can this be done with the communication between 2 Azure Functions?
Are there any good guides for it? Or are there any other good solutions instead of using access key and having them rotate with a certain interval?
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