There usually would be an email at the account email addy <sometimes they dont turn up I gather>
Try doing voice chat and sending messages to your buddies, if they work it wont be that.
yes i am still able to send messages so that cant be it, thanks for trying
i finally figured it out. the party was set for only 1 person. i simply changed the max number of players to 18 and i can finally invite people again!!