Through trial and error, I realized that the new employee must FIRST be created and then a time tracker invite sent.  If you send a time tracker request first, then it will never sync up with the new employee.  Even if the info is exactly the same.  There is no fix.  The initial time tracker account is just lost.

That works for new employees.  For employees where the time tracker has been created first, one fix is to change the employee's email address for time tracker login purposes.  If you cannot change the employee's email address, then another fix is to make a new time tracker login and make that time tracker login an alias for the employee's email.