IPTV issues

Hello,

I'm using Orbi AX6000 Tri-band Mesh WiFi 6 Router(RBR850) with one sattelite. Telia is my internet provider, and we are using Telia IPTV television too. If I simply connect everything to router, without modifying anything through router settings, then the Telia internet works, but IPTV doesn't. After setting VLAN ID 6 for IPTV, and ID 1 for internet (these VLAN ID's are recommended by Telia) - the IPTV works, and the internet (including wifi) doesn't work (you can connect to wifi network, but it says "no internet"). I have tried other VLAN ID's variations, and also a variety of priority variations as well, including setting priority 1 for internet and 0 for IPTV, and backwards, and also setting priority 0 for both - still, only IPTV works, and internet doesn't work. I have read in some internet topics, that in order for both internet and IPTV to work, I should remove the check from the 802.1q tag option near the internet vlan id, however I can't find this option in orbi router configuration. Would it be possible for you to implement some kind of firmware update maybe, so that I could remove the check from that 802.1q tag option? Or maybe you have anymore suggestions? Thank you very much!