Hey sjurick,


If you are working on a poly cage that has been turned into SubDivision surface, go right-click on the geometry and select "standard" mode, then try selecting "edges" from that same menu. Once you have the edge in question selected, go to "Subdiv Surfaces> Uncrease Edge/Vertex".

Then maybe try a partial crease a few times until you get it right.

Hope this helps.

!MasterFool