As an admin you can reset the user's phone number here.
https://mysignins.microsoft.com/security-info
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
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Hello
Please, I need your help on this issue.
One of my users is having a problem with his outlook.
When he tries to login to Outlook, he is asked to verify his identity.
We don't have the phone number and can't remember it.
Please, is this user able to login without verifying his identity, or how can we remove this account verification?
As an admin you can reset the user's phone number here.
https://mysignins.microsoft.com/security-info
--please don't forget to upvote
and Accept as answer
if the reply is helpful--