I helped couple of Experts & Customers regarding this issues. Below is the work around that you can try:
By pass the error
If CX is done entering all tax documents and ready to file
Go to file, complete Steps 1 to 3 of check out
Then it will go back to fix Federal (ignore this) after entering all information in Steps 1-3
Then ask CX to log out of TT to clear cache and cookies
Then log in to Google Chrome and TT account
Then complete the check out and efile process
