"Bad Request – Request Too Long” Error when accessing Microsoft admin portal

Sometime when you try to access the O365 Admin portal you have an HTTP Error 400.

This is due to some data that stay stuck in your google chrome browser.

To fix it you have to clear chrome cache.
  • Go to your browser settings (chrome://settings)
    • Cookies or other site date,
    • See all cookies or site date
  • Or directly to chrome://settings/siteData
  • Filter using admin.microsoft.com
  • Clear all data related to admin.microsoft.com

That's it !

In some article, people are deleting all browser data (cache, cookies, history). In my case, I'm checking  data when I'm doing some testing, so I prefer to not delete information if it's not mandatory.

You can follow M365 service heath on twitter: @MSFT365Status.


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