sram xdr cassette installation

[jacke]

I am trying to install a new SRAM cs-xg-1290-d1 cassette onto a new Mavic Cosmic SLR wheel. The hub on the wheel is XDR, I can see the threads on the hub body for the cassette. When I slip the cassette onto the hub I see the splines of the cassette slip into the cogs on the hub. I am using a Park Tool FR-5 cassette lock ring tool for the procedure. The depth of the splines on this tool is about 7.5 mm. The problem is that I cannot get the lock ring tool to rotate at all. I have used as much force as I dare to use for fear of damaging something. It would seem that the tool should turn fairly easily initially. I have tried putting an inward force on the tool while rotating it. What might I be doing wrong?

[ichitan]

It is really difficult to know when we can't see it.

Maybe start by asking the company that makes the hub or wheel, if that cassette is correct for it.