Outlook email - unable to verify account information

My outlook email stopped working so I followed guidance elsewhere on here and deleted my account, reset iPad and tried to re add outlook. After pressing outlook option I get the immediate message ‘ unable to verify account information’ . This is before I have managed to get to the point it usually asks for I’d and password.

yet setting for mail, contacts calendars and reminders appear. If I press ok on the error message I can then cancel or save seeing’s. If I press save I get Ann account with a ‘?’ And a message that says enter the password for the outlook account ‘(null)’. But no option to do so.

it is and older iPad Air.

thank you.