Catalina 10.15.6/IOS 14 Update: Email no longer updates other devices.
This past week I updated my devices to IOS 14 and now email no longer updates my devices. For instance, if I delete an email on my iMac, it still show up on all my devices. Likewise, if move an email to a saved folder, on my iMac, it only moves on that device, and it remains in my inbox on the other devices. It only shows up in the folder on that iMac. This worked fine on the previous IOS version.
iMac Line (2012 and Later)