Outlook IMAP - Downloading messages into subfolders but not into the main Inbox

This is based of this query on a support forum - https://community.plus.net/t5/Email/Outlook-downloads-emails-to-subfolders-but-not-to-Inbox/td-p/1932925

We provide no warranty for potential issues with Outlook syncing - use the following information at your own risk.  Alternatively contact an IT Professional to troubleshoot your issue.

If you have email in your webmail account, or IMAP subfolders, but Outlook will not download messages stored in the main Inbox.

This issue can occur if you connect Outlook to your mail account using IMAP, then create a folder in the Roundcube email client after setup.

To test if this is the case you can double-click your mouse in the inbox email column.

Most folders will allow you to create a new message but if you have the issue you will see the Error pop - You do not have permission to create an entry in this folder.

How to resolve the permission settings for your inbox