MdbReplicationProtectionUtilizationMonitor is unhealthy when creating Outlook event


Hi there,

I have an enterprise app that gets installed into customer accounts. This app attempts to write calendar events to Outlook. One account is receiving "MdbReplicationProtectionUtilizationMonitor is unhealthy" every time we attempt to write events to their calendars. I have not seen any documentation on what this is or how to fix it. We waited a few minutes between requests to see if it was an intermittent issue, but it seems to be persistent.

Does anyone know what this error means and how we can work around it?

Microsoft Graph
Microsoft Graph
A Microsoft programmability model that exposes REST APIs and client libraries to access data on Microsoft 365 services.
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  1. Siddharth Gautam 855 Reputation points

    Hello Connor Maddox,

    Thanks for posting!

    As per my research, the "MdbReplicationProtectionUtilizationMonitor is unhealthy" error message refers to throttling issue with error code 503.

    When it comes to MS Graph API throttling, we suggest:

    • Reduce the number of operations per request.
    • Reduce the frequency of calls.
    • Avoid immediate retries, because all requests accrue against your usage limits.

    There are some best practices to avoid the throttling while using the Graph API requests.

    • Wait the number of seconds specified in the retry-after header.
    • Retry the request.
    • If the request fails again with a 429-error code, you are still being throttled. Continue to use the recommended retry-after delay and retry the request until it succeeds.

    If no retry-after header is provided by the response, we recommend implementing an exponential backoff retry policy. You can also implement more advanced patterns when building large-scale applications.

    Refer this document for more details- Microsoft Graph throttling guidance - Microsoft Graph | Microsoft Learn 

    Also, we have some service specific limits in regards with different O365 workloads. Please refer this Microsoft document for this- Service specific Limit

    Hope this helps.

    If the answer is helpful, please click Accept Answer and kindly upvote. If you have any further questions about this answer, please click Comment.

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