How do I change a user’s phone number for 2FA in Office 365?

It sounds like you're in a bit of a pickle! If you need to change a phone number for 2FA, the process depends a lot on your admin privileges. If you're a global admin in Microsoft 365, this link might help you reset 2FA: cosmistack.com/blog/articles/how-to-reset-mfa-for-an-entra-id-user. Just remember to really ensure you're selecting the user properly in the admin portal.

Honestly, being an admin can be overwhelming, especially if it's not something you signed up for. Regarding the new phone number, it might be worth checking with the user about why they changed numbers. Sometimes, if it’s a personal phone, they switch numbers without a lot of options. If you're looking to disable 2FA temporarily, keep in mind that it usually varies depending on your tenant's setup.

Changing the phone number can be tricky, especially since the system UI can change. Just be sure you're following the proper steps in selecting the user – don't click the box next to their name, but actually click their name to edit. That’s often where people get caught up!

Glad to hear that you've figured it out! It's easy to get hung up on the steps. Just remember to keep track of these changes going forward so that next time, it might be a smoother process!