You can follow along here
https://support.microsoft.com/en-us/account-billing/common-problems-with-two-step-verification-for-a-work-or-school-account-63acbb9b-16a1-47b9-8619-6a865e8071a5
or also ask for account help here. The product group for Office 365 actively monitors questions over at
https://answers.microsoft.com/en-us/msoffice/forum/msoffice_account
--please don't forget to upvote
and Accept as answer
if the reply is helpful--