Return
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Title
Error occurred while executing the request. 429 (Too Many Requests) { "statusCode": 429, "message": "Rate limit is exceeded. Try again in x seconds." } -
Description
Error occurred while executing the request. 429 (Too Many Requests) { "statusCode": 429, "message": "Rate limit is exceeded. Try again in x seconds." -
Cause
This indicates throttling being done by Microsoft. The Microsoft server is not able to handle the requests.Throttling can appear as HTTP 429 errors (“Too Many Requests”) or HTTP 503 errors (“Server Too Busy”).On or around March 24th, Microsoft posted the following notification publicly:Many SharePoint Online and OneDrive customers run business-critical applications against the service that run in the background. These include content migration, Data Loss Prevention (DLP), and backup solutions. During these unprecedented times, we are taking steps to ensure that SharePoint Online and OneDrive services remain highly available and reliable for your users who depend on the service more than ever in remote work scenarios.In support of this objective, we have implemented tighter throttling limits on background apps (migration, DLP and backup solutions) during weekday daytime hours. You should expect that these apps will achieve very limited throughput during these times. However, during evening and weekend hours for the region, the service will be ready to process a significantly higher volume of requests from background apps. -
Resolution
Split your migration into smaller chunks and migrate them one by one. Always run only one task at a time as to not encounter the same error. (OneDrive, Teams, and SharePoint all fall under the SharePoint throttling policy so these should not be run at the same time).The On Demand Migration tool tries to utilize as many concurrent connections as MS allows. However, the current situation with the pandemic has forced MS to implement throttling on their servers.
And we have this community post regarding this error and throttling:
https://www.quest.com/community/blogs/b/microsoft-platform-management/posts/impact-of-sharepoint-online-throttling-on-migrations