Hi Sarvani. I'm Greg, 10 years awarded Windows MVP, here to help you.
For Microsoft Authenticator app stuck in Verify your identity loop, see here:
https://community.powerbi.com/t5/Desktop/Micros...
https://answers.microsoft.com/en-us/outlook_com...
https://docs.microsoft.com/en-us/answers/questi...
https://support.microsoft.com/en-us/account-bil...
https://answers.microsoft.com/en-us/outlook_com...
https://docs.microsoft.com/en-us/answers/questi...
https://answers.microsoft.com/en-us/msoffice/fo...
https://www.reddit.com/r/Office365/comments/pr0...
https://www.reddit.com/r/Outlook/comments/ng6pt...
https://news.ycombinator.com/item?id=28834260
For further help if none of these work Contact Microsoft Support at https://support.microsoft.com/contactus. Explain the problem to the Virtual Assistant and keep asking for an agent, to get chat or a call back on week days.
Feel free to ask back any questions. Based on the results you post back I may have other suggestions if necessary.
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