A lot has changed since 2020 . . . 

For anyone needing an update on this, the place to "Remove Access" or "Cancel Invite" is now next to the Edit link in the top-right of the "Permissions" tab.  Once you have done that -- and after you have updated the employee's email address in the "Profile" tab -- the option will show up in the "Permissions" tab to send a new invite, and QBO will verify what email address to send the invite to.