I had a similar situation when configuring IMAP for my email client. It turned out that even though everything looked right on the server end, there was a minor configuration issue on the client side.
Double-checking the incoming and outgoing server settings along with authentication methods might help pinpoint the issue. Also, ensuring your email client is updated could make a difference.
By the way, have you considered using Microsoft Office Professional Plus 2021? It's been reliable for me in handling email and document management tasks seamlessly. Might be worth exploring if you're looking for a robust office suite!