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When logging into Microsoft Office 365, an error "AADSTS50107: The requested federation realm object '' does not exist." can occur as depicted below:


1. Clear the cache and cookies on the browser for all time

Instructions to clear cache and cookies:

2. Close the browser.

  • Windows: Close out of all windows and tabs.
  • Mac: Hit Command and Q to quit out of the application

3. Open a new window and go to not use any old bookmarks. Feel free to replace your old bookmarks with this URL.

4. Log in with without using any saved password (If you have been using Chrome's saved password feature to log into your account prior to the email migration, you will also need to clear the saved password in addition to clearing cache and cookies.)

Need Help?

Contact the IST Service Desk at or 519-888-4567 ext. 44357.