HDMI 2.1 cables can handle up to 48Gbps and can support Dynamic HDR at 4K/120fps and 8K/60fps. Game consoles and virtual reality headsets benefit from HDMI 2.1's VRR (Variable Refresh Rate) and QFT (Quick Frame Transport), which lets a TV adjust its refresh rate in real-time to the frame rate output by the gaming system and speed up the HDMI 2.1 to HDMI 2.0 Adapter/Converter: If your display has an HDMI 2.0 input, you can use an adapter or converter to connect the PS5’s HDMI 2.1 cable to the HDMI 2.0 port on your TV or monitor. This will allow you to enjoy the PS5’s 4K gaming capabilities, although without HDMI 2.1-specific features like VRR. Here I am suggesting using a 1-in/2-out HDMI 2.1-compliant splitter so I can select whether the PS5 output goes via the PSVR breakout (which would be an HDMI 2.0 connection) or direct to the TV (HDMI 2.1 connection). It would mean using two HDMI input ports on the TV, but would hopefully mean we'd have full HDMI 2.1 for normal gaming and be HDMI 2.1 is backward compatible with previous versions, so you can use HDMI 2.0 cables in 2.1 ports; HDMI 2.1 offers significant advancements over HDMI 2.0, including higher data transmission rates (48 Gbps vs. 18 Gbps) HDMI 2.1 cables in 2.0 ports will only deliver HDMI 2.0 performance if the connected devices aren’t HDMI 2.1 compatible
Likely the HDMI port you've plugged into either: A. Doesn't support 4k60fps for some reason. B. The HDMI cable you're using isn't 2.0 or higher/doesn't recognize it as a 4k60fps. I'd suggest verifying the port can do 4k60fps, if it still doesn't work update the firmware on your TV then try again and/or try another HDMI cable that is at least 2.0.
In their specifications page, they list 2 HDMI 2.1 ports on this reference. But like a walking couch salesman’s contract, there are words in very small print and at the bottom of the spec sheet: “Due to the subdivision of HDMI certification standards, HDMI 2.1 is divided into TMDS (bandwidth is equivalent to the original HDMI 2.0 and FRL QIuTa.
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    • can you use hdmi 2.1 on hdmi 2.0 port