Our League has a League hall, and two other friendly Leagues have given me access to their Halls. If I use one of the teleporters in the watchtower it will only give me access to my own League Hall. But if I use the teleporter from my lair, in which I have a Bases and League Halls Mod, then I can get into all 3 League Halls that I have access to.
I find it very hard this is intended. First, it forces ppl to purchase a teleporter which is against the whole this is a free addition to the game concept. Second, why give a list of League Halls to select to warp to if you will only ever have one option? If this was intended there would be a popup confirmation, not a list of halls to select from, with only ever being able to select one, that would be dumb.
Its not intended, its a known bug that others have mentioned. There would be no need for the selection drop down on the teleporters in the HQs if it was intended, those teleporters would just take you directly to your league hall.
Umm I had a similar problem at first but I got into my friends hall no problem from the watch tower. All I had to do was treat it like entering a friendly base, open up the base tracking thing and select their league hall. After that it turned up in the watch towers League hall menu.
So I tried to track a hall I've been invited to, and I looked on the Social menu first (left D-pad on the controller). The game is treating a League as a character, so its giving me options of "invite to League", "Send Tell", "Invite to Group", etc. But I did find where to toggle their hall on the map version of base tacking. Their hall was listed in the middle of several bases in one of the cities.
