Mail stuck on Moving Messages and not syncing with iCloud
I have seen similar threads that have issues with Gmail or Exchange, but mine is with my iCloud mail and occurred after the last incremental update before 10.15.5 (19F96).
My mail on my phone or on iCloud.com functions as it should deleting, moving, etc. my email.
The changes are immediately then made to the same email in Mail.
However, any manipulations to email in Mail do not get synchronized with iCloud.com or my phone.
Mail keeps consistently show "Moving Messages" x of y (of some number for x & y).
I have tried everything that I could think of short of chanting over it with a chicken's foot... HALP!
MacBook Pro 13″, macOS 10.15