Использование Outlook для Android для работы с личной электронной почтой и календарем
Hi,May I ask what specific email provider it is?
If it's an Outlook.com account, can you manage to log in to Outlook.com online?
If so, please try to clear the cache of the Outlook App, then try to log in.
If you have any other verification or ways to sign in. Try using a different method to sign in.
I look forward to your response.
Stay Safe!