Hi I am logging in on the data sharing tab in options but keep getting message invalid used ID or password. Have tried resetting password but same message. Same on other iPad so must be something with administrator account

Hello,
I like to create games rosters and send links on my iPhone but then do the actual scoring on the iPad. But somehow I can nog log in to the admin website on the iPad even though I have registered both devices to same emailadress. I keep getting message invalid user Id or password.