Phone Account to Computer Account



I couldn't find an answer to this problem so am starting a new thread and hope somebody can assist us.

A fellow guild member started his account in "L" world on his phone. He is wanting to help in GvG but since he cannot access GvG from his phone he has been trying to log in on a computer. However, he keeps getting a message that says "You are not active in any worlds" and to start a new game.

Can anybody help with this? I've heard a few others who have had this problem. If they started an account on a their phone this account is not active on a computer.

Any suggestions would be greatly appreciated.