Ahhhh. I had that hybrid in the past and I remember the exact same problem.
We probably got the plants from the same pod lol.
I tried to gently pry the lip open, but I found out that the lip itself is deformed.
It was too long in certain places and is blocking the entire lip from unfurling.
I think I still have the plant in my GH somewhere. It just has not been blooming lately.