@BlueWizardRob this was not the case in my situation. I have tried all sorts it is almost impossible to host party and invite the friends and get them to join in my case. Must be doing something wrong if only handful having this issue.
@Mjpasonable I have experienced that. What I do when the invitation got lagged is I close the game and my friends have the invitation. Dunno what happens. But for sure, party is so bugged. The secret agent haven't found the secret information though.