This may help: https://salvagedinspirations.com/painting-over-wallpaper/
First of all you should never paint wallpaper unless it's made to be painted. It will or could cause lots of problems. Bite the bullet and remove it. You'll be glad you did it right.
I would not paint over wallpaper, I would remove it which will take a while but you will be glad you did that in the end.
Jeanne....I agree...don't paint...remove first!