No way to Invite Friends...

If the server is full, your tab will not be present and you wont be able to invite friends. In empty servers or servers that have open solts, there you can invite friends.

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My friend is having this problem and it has nothing to do with the lobby. His Origin overlay doesn't work while in game and he doesn't have the option to invite friends from the main menu lobby where you select the option to play campaign. 

Is your friend in Origin invisible? If so, he must go online to invite friends.

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He's not invisible. Outside of game, he can see everything you normally can on origin and we can see him. Once he starts his game he doesn't get the option to invite friends and his Origin Overlay doesn't work. 

No, I did not mean that. "Invisible" is an option he can set himself, by going into his profile and selecting "Invisible". He will see everything as normal, but you will see him as offline in Origin friend list. 

If he has that on, tell him to go online. He can also re-install origin, if something wrong happenes. Also if his friends are also "Invisible" he can not invite them.

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I guessed you missed the part when I said "we can see him" as in, it shows him online and when he launches the game we can see him playing it. He's not invisible. 

No I did not miss that part, just was making sore you wore 100% sore (as this problem happens because of that).

Re-install origin and report back. Also try "Repair Game", just press your game icon in origin and press "Repair Game".

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Hi, I'm having the same problem. I've tried both of those suggestions and they haven't worked. The Origin overlay works in Battlefield 3 and Dead Space 3 but it's not working in Titanfall.

In my case this was caused by Rivatuner and the Origin overlay disliking eachother. Basically it seems like if the origin overlay is either disabled or not working due to some other program interfering with it the INVITE button won't appear.

Same problem here. I just dont have "invite" button in game and my friend has it occasionally, from time to time. He cant join me, using origin, but i can join him/ Sometimes both of us arent able to join each other. Could you help us to solve this problem?