Quoting a reply from another forum user:
"Have you performed the requested manual focus as the message requests? Pint to a bright star, manually focus, make note of the focus value, then attempt to go to a DSO. If that is successful, change the default focus value to this new value (Me->Focus->Star Focus POS Default.
It's Chinese New Year so I wouldn't expect any reponse from ZWO until later this week (next week????)...."
I'm facing the same issue, I'll try the solution proposed tonight (finger crossed)...