Outlook IMAP: the folder in inbox cannot be selected

Outlook IMAP: the folder in inbox cannot be selected

Hi, my client has Outlook running. She is trying to delete emails and also move other emails to folders. Whenever she does, Outlook is give the error:

The folder in inbox cannot be selected. Either this is a limitation of your IMAP server or Ibox has been moved.

Is this an issue with the IMAP prefix?

How can I resolve this?

Many thanks. Loving Zoho!!