TV as main monitor

I desperately need help. I'm trying to set up my MSI Katana Laptop as a HTPC and it will not set the TV as a main monitor to boot into with Steam Gaming Mode. I've tried all the possible config options in 10-gamescope-session.conf and nothing. My HDMI is on card1 but it keeps connecting to the integrated graphics on card0 and I can't seem to stop it. Happy to give any info that's needed but I just don't know what step to take next.
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