My mates mic ends up crackling and he sometimes lags, he instantly blames live service or the game servers or me lol but tbh he is using a powerline adapter which i suspect is giving him packet loss. He won't believe it so i stopped mentioning it.Downloaded Diablo 4 at 890mbps last night.
My download speeds are always in excess of 500mbps.
I suggest it's not the xbox
Best option as always is to wire up rather than using wireless/powerline.