[Problem] Can’t shift to the largest cog on the cassette (10 speed)

I bought a Tacx Neo 2T. I want to use this with a Shimano 105 5700 10 speed cassette.

I installed the cassette with the 1mm spacer supplied with the Tacx and a shimano 1.85mm spacer. This should work in theory, but I can't seem to get the chain on the largest cog when shifting. I checked the cable tension and adjusted it again, but without success. The reach of the derailleur is well adjusted as it worked fine on my bike.

Now there are 2 extra spacers with the Tacx that you can place behind the freehub. Maybe I should put one of those in there?

Does anyone recognize this problem and if so, how can I solve it? Maybe I'm still overlooking things?

Thanks in advance for the responses.

PS. New cassette and new chain :-)