Hello, and yes, it's my Samsung Tab A which already came with an S pen, and my tablet doesn't detect (on some spots) the s pen whilst the magnetic cover is on, so it works just fine once I took the cover off, sorry if I was unclear before
I'm using a Tab A and my S pen didn't work with my very comfortable magnetic case :( until of course I took it away, and some spots on the screen worked with the pen when with the case didn't.:'(