Forum Discussion
SharePoint 429 Error - Throttling
Sharegate has released a new version which should get a higher priority from Microsoft which than should decrease the number of 429. We did not try this version yet because we finished our migration.
The 429 throttling errors are to protect the tenant so they might occur in different situations in different tenants. Our was situated in the UK and we were throttled suddenly in Feb-2018. Before we did not have any 429 issues and we converted 6Tb before. When moving off hours we were able to run Sharegate again without many 429 errors. Microsoft has a SLA on availability NOT on performance that is why they will do anything to protect their office365 tenants.
The timing of 429 errors starting to appear was early Feb 2018 for me as well. Other threads and people I've had conversations with share this timeline as well. It seems something changed in either the way throttling happens or the thresholds were tightened around this time - still trying to get some official information from Microsoft.