I followed your suggestion but it had no effect on operation. Call forwarding did not happen.
My procedure, please confirm that it is correct: I used the expert tool to display the ITSP Profile A General and removed the check mark in the digit map obitalk box by clicking on it, that forced a check mark in the device default box which was removed by clicking on it, I could then modified the contents by inserting *72|*73| after the starting parenthesis and submitted the changes. There was a red exclamation point at the end of the parameter after I had made the modification. The red exclamation point was still there after I had changed the digit string back to its original form.
I also tried the modification suggested by Phone Power -- inserting an asterisk in front of the existing asterisk on the *72 and *73 star code strings in both Star Code Profile A and Star Code Profile B. That mod did not work either.