GGI and 1:1 Domain Interface connections

isabel

I have a 3D geometry composed by a domain and two subdomains.

I have solved a problem using a 2D extruded mesh from CFX-MESH. With tetrahedral elements. I have defined the Domain Interface connection as 1:1 and it runs perfect.

Then I tried to solve it using a 2D extruded mesh from ICEM CFD. With hexahedral elements. I can't use a 1:1 interface connection, so the problem doesn't converge. Why can't I use 1:1 connection here? Can I change some parameter?