RP4 No Display with Soundbar

I'm sure I'm doing something stupid here, but hopefully someone can help.

I've tried plugging in my RP4 into my TV (Samsung KS7000) and it works and displays just fine. However, I'm not able to get the full audio to pass that way. I've tried plugging it into my Soundbar (Q90) to test the Atmos audio, however the RP4 will not display at all when connected into the Soundbar. I must be doing something wrong here. I do have the cable connected in the right port on the RP4 as it does display just fine on the TV, just not when connected to the soundbar.

Any ideas?

Quote from blueribb

Are you using the hdmi port next to the power jack on the RP4 ?

Did you try toggling the Source button on the Soundbar ?

Did you trying turning each component off and then on once connected ?

Thanks for the reply. I have ensured it was in the correct HDMI port of the RP4. It does work just fine connected to the TV, just not on the soundbar. I've toggled the source on the soundbar and cycled through the HDMI ports on it and nothing displays. It does display my PS4 fine though, so I do know it's passing that just fine. I have also tried cycling the power too.