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Microsoft Graph Error ResourceUnhealthy

November 2, 2023

Ran into an issue with the sendMail resource within the Microsoft Graph API.

Calls to:

https://graph.microsoft.com/v1.0/users/<USER>/sendMail

Resulted in this response:

{
     "error": {
          "code": "ResourceUnhealthy",
          "message": "MdbReplicationProtectionUtilizationMonitor is unhealthy."
     }
}

Based on the information I can find it appears to be related to throttling.

The response should contain a retry-after header that provides the number of seconds your application should wait before attempting to resend the message.

DO NOT attempt to resend immediately as this will simply add to the throttle limit.