Live wallpaper not running!
Not much of an explanation to receive a solution...
Did you try to install the 7 Pro live wallpapers? Because I've heard those don't work on non 7 devices
They work on mine ...
Oh, I heard reports that some people were having issues getting them to run. Maybe they've since been working.
In that case, yes, we need more information, OP
no not only 7 wallpaper all live wallpaper not run on 6t
OnePlus 7 Series: Review and Spread the word
by David Y., 2019-06-13