Alpha Matte on Illustrator layer

Hi there, relatively new to After effects, so sorry if this has been posted before;

I´m trying to get my composition in the bubble by using Alpha on the Illustrator layer that is the bubble , but it seems that the only TrcMat that gives somewhat wanted result is the Luma Matte.

When I try to use Alpha the bubble is all white, and not showing the comp. I´ve tried changing the mask from Add to subtract, with and without inverteded.

What the duck am I doing wrong? These are my settings.