Thank you for your replies. I imported the geometry from a cad program. Shall i post the screenshot of the contact regions?

Also I just noticed that I don't have the option of "Mesh Interfaces" in Setup. Tryin to figure it out.

Edit: Solved the problem with mesh interface. For the first time ever I got an interaction between the two enclosures. When I use a plane in post and show the pressure it looks valid. Although when I changed the parameter from local to global I got again the same problem as described above. At least it now it seems to work. Thank you for your help.