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Based on the error message you shared this could be due to insufficient permissions. It appears that the Service Principal permissions are missing. If you are using Vault access policy, make sure that you have added policy for your service principal with necessary permissions under Access Policies section of your key vault. The permissions are missing from the Identity blade, and you will need to add via the Portal, for more information please review the below post, which is similar to this issue.
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Akhilesh.
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