As we figured out (and MS confirmed this) when "initial encryption scan" was aborted decryption stopped- not canceled, not rolled back, but stopped

(as per MS there is bit - sorry, did not get where 🙂 that shows- decryption hits an error and waits for restart). Essentially that means: 1) DB is still encrypted; 2) we need to re-issue decryption again, i.e. ALTER .. OFF. I did test in BR (backup/restore) server with the same TDE configured- restored Prod backup and decryption started immediately and completed in 15 min. With this info and test results I re-started Decryption- everything was fine. Then encrypted back DB- end of story. Thanks