Now you may have the issue where the green arrow which means “move request” is by a mailbox you want to move and if you try to move the mailbox you will notice you don’t have the option to move the mailbox.

This is because the mailbox has been moved before and you must clear the previously completed move request to enable you to move the mailbox again.

So if we go to Move request tab and simply clear the move request of the mailbox we want to move, we will then have the option to move the mailbox

Daniel Davies