Hello Andreas,nThank you for your reply.nI tried a simpler model as you suggested and this was the result.nBoth of these elements are identical with the exception of the control points they're assigned to. This means that the elements have slightly different orientations which might be why one is experiencing contact and the other isn't.nAlso I noticed that changing the value for the number of interpolation elements (NISR) affects whether an elements experiences contact even when IGACTC is active for mortar contact.nI tried CONTACT_AUTOMATIC_SURFACE_TO_SURFACE and CONTACT_AUTOMATIC_SURFACE_TO_SURFACE_MORTAR with and without SOFT=1nKind regards,nAhmedn