Can you install peel and stick tile over existing ceramic tile (bathroom). I am trying too but the tiles don't won't to adhere? I have even sprayed 3M adhesive first!

It is not advisable to install peel and stick tiles over ceramic tile. Any issues with the ceramic tile will telegraph up and the grout joints will eventually show through. You should remove the ceramic tiles then install the peel and stick tiles on 1/4" cement board laid on your sub-floor.

Amricca is correct and now that you added another adhesive you probably have a mess on your hands. Peel and Press needs a adhesive primer to really stick but don't do it over existing ceramic.