I bought this. Would that work or I need a dual? https://www.amazon.com/dp/B08233VCKK/ref=cm_sw_r_cp_api_glt_fabc_DA2EBQNBZDAZFSQH0PKA

This is your cable. I bought these when I ran into the same issue with my FM and Sample:

https://www.amazon.com/gp/product/B000068O3F

Had initially purchased these but they behaved as you described so I had to buy the first ones: https://www.amazon.com/gp/product/B08233VCKK