An Azure service that is used to manage and protect cryptographic keys and other secrets used by cloud apps and services.
Hi,
The access permision is not granted în this way.
You basically need to create an managed/user identity for the function app and then create an access policy în the key vault.
More info at:
https://learn.microsoft.com/en-us/azure/app-service/app-service-key-vault-references#granting-your-app-access-to-key-vault
Hope this helps!