Hdcp error live tv

Trying to watch a livetv stream (Aus - 7plus), and can’t get it to work in Vivaldi/Firefox on Tumbleweed or Ubuntu (hdcp error ie indicating HDMI cable is not up to scratch…) but works ok with Win11, all on the same PC/monitor, triple booting off a single SSD.
Everything else works fine.
Any suggestions?

I guess to problem has to do something with DRM but it would be good to see the actual error you are getting.

Can you try playing the livetv stream using vlc?