Players must be Battle.net friends or part of the same Battle.net community to invite or receive an invitation to an opposite-faction guild on the same realm.
It seems odd, but this makes it sound like you cannot simply invite your own alts if they’re on the same Battle.Net account, and I do notice some comments in the GD thread corroborating. I anticipate some clarification forthcoming shortly.
I totally forgot about this restriction to invite the opposite faction to the guild. I’m sad, I was looking forward to inviting all my horde alts to my alliance guild, couldn’t do it ingame and came back here to this forum. I’m a solo player with two faction separated guilds. Was looking forward to this feature.
This is a peer to peer help desk. The hyperbole over how you feel about Blizzard isn’t necessary as we try to help people. If you have feedback about the guild system, I encourage you to submit it through the in game suggestion tool or on General Discussion. The system does need help and constructive feedback is very helpful and needed.
I haven’t tested it yet, but I read that you can promote a xfaction member to Officer rank and list it in the guild finder.
In other words, if you’re guild is Horde, make one of the Alliance members an officer. Then log onto that Alliance character and list it in the guild finder. I’m not sure if it would also need to be listed in the Horde guild finder too, or if it could just be listed regardless.
Edit: In case anyone comes across this, I have tried putting my Alliance guild recruiting in on Horde side to no avail. I tried with it expired on Alliance and then tried again after I re-listed it on Alliance.