ok have u instructed them to login to the game useing there gm account and goto the ootp tab and then online league setting and click it and then click on import account data file and browse for it and click on it and then click ok then have them click check accounts data file and then save and close ?
and them may need to restart there computer to get it to take to
below is a useful power point i put together feel free to share it
power point step by step for setting up for a online league for gms
step by step ootp 12 setup and login.pptx