Apple

When I try to connect my Samsung TV with my iPhone XR I can find it on my phone, mirror my screen with AirPlay turn the TV on and even control the tvs volume, but when I try to use the Apple TV Remote app it gets stuck on “searching” and I can’t even access the drop down menu to select my TV. On a similar post here OP said he fixed it by adding his TV to HomeKit, but I can’t use that solution because as apple said, “Samsung AirPlay-compatible smart TVs don't support HomeKit and can't be added to the Home app”. Is there a way for me to use my phone as a controller in this TV? The model code is UN50au8000gxzd.