probably a really stupid question, but here goes. Is your TV a 4K TV?
I ask because there are MANY folks that don't realize you can't watch 4K if your TV isn't 4K. If your TV is HDR or HD, it will downgrade (I forget the actual term) to whatever your TV is capable of. Also, 4K and HDR are different, IE a 4K TV may not include HDR and there are many variants of HDR.
Good luck.