For the created key vault, set up an access policy to allow the earlier registered app to access the key vault.

On creation of the access policy:

• On permission selection, select these Secret permissions: Get and List.
• On principal selection, select the earlier registered app.

For more information, refer to Assign a Key Vault access policy.

Notes

In your AS2 setup, you can use several app registrations and several key vaults. If you, in this case, use one app configuration, make sure that each used app registration has access to each used key vault.