If the mobile number isn't appearing from WGS to Full Time:
If a mobile number isn't appearing on Full-Time there is a high-possibility that the format isn't being recognised when the club is integrating.
If this doesn't work:
Check that the club has listed the person as "Team Secretary" role or is listed as "team manager or coach"? You can check this in the leagues Full Time site, go to the league > Search People > check to see if they have an admin role.