Tacx flux s

hello together

since weeks I try my road bike, with 12er sram cassette on my flux s smart trainer to get. I have now several erroneous orders behind me and unfortunately it still does not fit. can you hopefully help me and explain what I'm doing wrong? my bike is a canyon ultimate (sram xdr force 12x cassette) my roller trainer a flux s smart (whether year of construction before 10. 19 I do not know exactly. the t2675.76 engages in any case.) in addition, of course, I bought a thru axle adapter (thru axle adapter kit 12x142/148 type 1) unfortunately, the end pieces that are attached directly to the trainer can not be screwed on, they have too small a diameter for my roller trainer. please what do I do, I'm so hungry for indoor training?!

regards

luc