Boundary blend failure with vertex

Hi,

I am trying to create a boundary blend surface with two chains converging to a vertex point but it keeps failing and I'm not sure why.

I'm sure there aren't any open points in the chain loop.

For two of the chains, I used curve through points and ensured they both connected to the vertex point.

It informs me that the entities are tangent at the highlighted point and they should be made non-tangent. I made the curves free at the point and its still failing.

I have attached images of the boundary blend operation failing as PDF and a copy of the Creo model.

Thanks,

Sam