why can i not join my friends/crew members on gtaV online?

Rockstar Games

After reinstalling gtaV recently me and my pals wanted to play online, we've been in the same crew for almost 10 years.. now all of a sudden since reinstalling the game..

it won't let me join my friends/crew.. nor will it let me invite them to my lobby..

I've no alert or message stating any ban (which there shouldn't be as I haven't played the game in ages) Please can you help me sort this out ASAP? Many thanks P.