iMessage error occurred during activation
so this is my brothers phone and i’m trying to set up iMessage and FaceTime for him without a sim card in his phone as he’s young. this used to be my older phone and recently signed into his phone with his iCloud (connected to family sharing) does anyone else have this problem? when i try to log in it doesn’t give me the option as the sign in button is greyed out and doesn’t have a bar to put a password - though i wouldn’t think that i need one? can anyone help me out? thanks
(if it helps the phone is 6S)
iPhone 6s, iOS 13