MLO Flint 3 and Samsung S25U and S24U

Hi there. I’ve just bought an Flint 3 router and I want to use the MLO tecnology with my devices Samsung S25U and S24U. I have set the MLO with the same names and security for the 6 and 5 Ghz but this device doesn’t want to connect in MLO and goes only in 6Ghz as preferred. What did I do wrong?

Thanks for help!

I have found seperating MLO with a different ssid to normal wifi works best.