Topic: Out of sync on the other hand

Using slp dubbing version, screen sharing and sending audio through nexus.
On the other side , client side or when I double check with my phone or iPad the video is out of sync for the first seconds then become in sync after 7 or 8 seconds which is far too late for checking ADR on the other side.
How can it be better?
Of course both sides are decent connection 800 dl /400mbits ul from my side
All the best