Hi Andrew,
Who is the Email provider?
You may have to enable POP access for your account before you can configure it.
Press Windows + R, type %localappdata%\Microsoft, and press Enter.
Delete the Olk and OneAuth folders.
Restart Outlook.
This only removes temporary Outlook data that will be recreated automatically. Please try reconfiguring the account and let me know.
I’m eager to hear back and work together to find a solution.