Is Google Chrome redirecting you to onelogin whenever you try to login into any Google account? This is how to fix it:

1. Open Chrome
2. Type chrome://settings/siteData
3. search for onelogin in top right (see example screenshot below)
4. 
5. Delete the onelogin cookies
6. Now try logging to gmail again. Again see the annoying redirect?
7. This time search for accounts.google.com  in the top right
8. Delete it (this is the crucial step)
9. Now it should work.

If the same thing happens with Microsoft, you need to clear cookies for login.microsoftonline.com