Hi Moyo Akintola
Thank you for posting on Microsoft Community!
For your concerned issue regarding "Microsoft Authenticator identification verification request keeps getting denied", we apologize for the inconvenience and inconvenience caused to your work.
First of all, could you let us know if you're using an Office 365 for business/education account or a personal Microsoft account that ends with outlook.com/hotmail.com?
If you are using a business/education account, kindly try the following steps:
First, take a look at the following article to see if you can properly configure the Microsoft Authenticator app:
Set up the Microsoft Authenticator app as your verification method - Microsoft Support
If you've enabled cloud backup before, check out this document: Back up and recover account credentials in the Authenticator app - Microsoft Support, you can also use it to recover your account.
If the issue persists and you need more help signing in to the Authenticator app, you may need to contact your organization's administrator to reset your account's authentication method under "Manage MFA authentication methods."
If you are using a personal account, please understand that our group offers support on M365 business/education account issues. Feel free to reply to us so that we can engage the specific personal account team for professional support.
Meanwhile, since your issue is about Authentication App, to help you better and not waste more time, I sincerely suggest you post in Authentication App Community, a delicate Team which focus on issues and consult about Authentication App.
Thanks for your precious time and your understanding would be highly appreciated. Have a nice day!