Hi @Mikrt Could try setting up the Universal Remote again but may not provide a solution. It appears there seems to be not so straightforward for programming the Smart Remote with Skyq on the newer models. one workaround another customer found was to go to Settings/123/RGB button, then navigating up/down to the 'control' section (below the numbers section), then navigating left/right to find the right button.
some more information here https://eu.community.samsung.com/t5/tv/qn900b-remote-vs-sky-q/td-p/5824294
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 5.0,Android 13 .