The solution is completely out of our hands, all we can do is be vocal enough that the people who can actually fix these time wasting “rejections” will hear them.
We used to do that through the premium 1:1 support but they got rid of that for some reason
In the screen shots above, the background is always white on the default theme.
So on this screen, the background is Common > Background > Action Bar Background and you have that set to black.
And you have your Phone > Incoming Call > Call Background just plain black.
This should be OK but since you are getting rejections the only thing you can do is maybe change the incoming call screen to dark grey, or some design. Since opening tickets hasn’t worked they haven’t given you much choice if you don’t want to suffer invalid rejections.