I have this same problem with my Catalina MacOS, TTAX deluxe 2021. Deleting the the plist did nothing (all it has stored is my name, macintosh model and user) and I have no intuit keys stored in the keychain.
Turbotax does not appear to let me load it's deductible summary entries manually. I spent hours loading items into it's deductible and I don't want to load them again into TTAX.
I can update TTAX deluxe app and I can log into it's deductible, so I have connectivity...
