I'm glad that you were able to resolve your issue and thank you for posting your solution so that others experiencing the same thing can easily reference this! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others ", I'll repost your solution in case you'd like to "Accept " the answer.
- Issue: Accessing KeyVault with Admin previleges via powershell resulted in error :
Get-AzKeyVaultManagedStorageAccount: Operation returned an invalid status code 'Forbidden' Code: Forbidden Message: The user, group or application 'appid=xxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxx;oid=xxxxx-xxxx-4e4b-xxxx-xxxxxxxxxxxxx;numgroups=1;iss=https://sts.windows.net/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxxx/' does not have storage list permission on key vault 'test-kv-westus2;location=westus2'. For help resolving this issue, please see https://go.microsoft.com/fwlink/?linkid=2125287
- Solution: After updating permission model from "Vault access policy" to "Azure role-based access control (recommended)" you were able to access the Key Vault without any authorization error.
If you have any other questions or are still running into more issues, please let me know.
Thank you again for your time and patience throughout this issue.
Please remember to "Accept Answer" if any answer/reply helped, so that others in the community facing similar issues can easily find the solution.
* Thanks,
Akshay Kaushik *