'You need to authenticate in Xbox LIVE'

I have downloaded MCPE 0.15.0 build 1 to my 2 tablets, Huawei MediaPad 7 Youth and an AOC tablet. I created 2 separate Xbox accounts for them (CETNT for the Huawei and Stick909101 for the AOC). The error is minor. The thing is that from the AOC to the Huawei I can join a game perfectly, but from the Huawei to the AOC it says 'You need to authenticate on Xbox Live' either via invites, via join a friend, and via LAN games. I downloaded the Xbox app on the Huawei and logged in, but keeps happening. Maybe someday I can send a screenshot