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Getting 'Request too long' when hitting the MDI portal
Over the last week, more and more of our support teams have been seeing "Bad Request - Request Too Long. HTTP Error 400: The size of the request headers is too long" messages when hitting https://ou...
- Known issue, engineering are working on a hotfix.
Once fixed, you should delete the local cookies, try again and it should work.
You can track status here:
https://health.atp.azure.com/incidents/tmcrvr4pkbbd
Joakim Hagström
Microsoft
MicrosoftAnother potential cause for this behavior is having a large amount of AAD group memberships resulting in a very long access token, as discovered by Per Stromberg . So if there is no service outage and all browser caches have been cleared and the issue still persists, that is a good area to turn your attention to next.