Xbox Cloud Gaming

Although i have fast internet : (1000M/bit)

i cant get xbox clud running on my android phone on 5GHZ stable. i checked everything. The network is stable on my side and works for all other streaming apps. Just when i start the xbox cloud to play something via stream it is lagging all the time.

However it is stable if i use Mobile Data on my phone. Can't figure out what is the problem.

:)