Try signing on here.
https://account.microsoft.com/account
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if the reply is helpful--
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I literally can't access my Outlook because of the Google One Account sign in box. It won't allow me past it so I can't go into Outlook to fix any settings. In Google settings, I have attempted to toggle off in security setting the feature to allow for easy sign on -but it doesn't fix the issue. I do have multiple gmail accounts coming into my MS Outlook 365 - I have had this set up for years and for some reason I am now having an issue with this pop up for sign in.
Try signing on here.
https://account.microsoft.com/account
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
Same issue here. The pop ups started yesterday. We have multiple email accounts coming into Outlook, same as Ann's situation.
I had the same problem yesterday. I called the Geek Squad and he advised that, like your online bank accounts, every now and again, Google wants to verify that it is you. I followed the Google prompts and within 30 seconds, it was done and I have not had a pop-up since. Hope this helps.
No comment this is of no value