Yes I understand. About that, have you tried to remove and add the account first on the app? If yes and still the same error shows that it cannot be verified.
I suggest to try and login your account via website first at https://outlook.live.com just so we can confirm if you can still sign in. Also, if you have changed your password or have a 2 step authentication this might cause issue as well as to why it is showing the error that it cannot be verified.
Let us know how it goes on your end so we can try to help. I appreciate your patience and understanding.
Thanks!