Cannot control Nvidia Shield volume while streaming to TV

My setup: - Nvidia Shield is connected to the TV - I use the optical out of the TV to connect two speakers - I use the Nvidia Shield remote to control the Shield volume out (not the TV volume or the speaker volume: just the Shield volume) This setup has worked just fine for years, but I recently changed my TV from an old Panasonic plasma TV to a QLED from LG and it doesn't work anymore. What happens is that I can change the volume just fine if I'm in the dashboard or if I play a file locally. But if I stream something (I tried Netflix, HBO Max, and Disney+), the volume doesn't change and I get the pop-up saying that I have to go into settings and set up the remote control. This ONLY happens when streaming, and it did not happen with my old TV. I can change the volume just fine if I set the output to be the TV speakers instead of the optical out, but obviously that's not what I want. I have tried checking/unchecking IR, CEC, and HDMI fixed volume control in the Shield's settings but no luck. I also try to set up the remote again but also there, no luck. I'm looking for suggestions on how to be able to make it work also during streaming. Thanks!