Key Vault extension for windows failure : multiple managed identities exist

Question

Key Vault extension for windows fails with timeout and error :

MSI URL: http://169.254.169.254/metadata/identity/oauth2/token?api-version=2018-02-01&authority=https://login.windows.net/cdc5aeea-15c5-4db6-b079-fcadd2505dc2&resource=https://vault.azure.net
2021-09-02 11:11:55: <error> [MSIAuthClient] failed to retrieve MSI token from response: {"error":"invalid_request","error_description":"Multiple user assigned identities exist, please specify the clientId / resourceId of the identity in the token request"}

I have already specified the parameter msiClientId in the authenticationSettings field but it still fails with the same error.

Answer 1

@Ricky Bansal
Thank you for your post!

When it comes to your error message, have you tried specifying the MSI using either msiClientId or msiObjectId for the extension:

        "settings": {  
            "secretsManagementSettings": {  
                "pollingIntervalInS": "14400",  
                "certificateStoreName": "MY",  
                "linkOnRenewal": true,  
                "certificateStoreLocation": "LocalMachine",  
                "requireInitialSync": true,  
                "observedCertificates": [  
                    "<certificate url 1>",  
                    "<certificate url 2>"  
                ]  
            },  
            "authenticationSettings": {  
                "msiEndpoint": "http://169.254.169.254/metadata/identity",  
                "msiClientId": "<msi ClientId> e.g.: "c7373ae5-91c2-4165-8ab6-7381d6e75619""  
            }  
        }  

For more info - KV extension for windows doesn't work well if multiple MSI assigned

Additional Links:
Key Vault virtual machine extension for Windows
How to use managed identities for Azure resources on an Azure VM to acquire an access token
Multiple user assigned identities exist, please specify the clientId / resourceId of the identity in the token request
Multiple assigned identities issue

If you have any other questions or are still running into this issue, please let me know.
Thank you for your time and patience throughout this issue.

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