Hi,
Is it an Outlook.com account or a Work account?
If it is a standard Outlook account, you can click "I do not have acccess to authenticator app right now", and you should be able to explore other options to get a code, to access the account.
I hope this information helps. If you have any more questions, don't hesitate to reach out.
Otherwise, please take a moment to rate the answer. Wishing you good luck!