Unable to access Olympic 4K Programming

I've been able to access Xfinity 4K programming for the last 2 years. However, I cannot access any 4K Olympic Programming. When I try to access, I get error message XRE-03133, indicating my TV must be HDR capable. I'm using the same equipment I have been:

TV-Samsung UN65KU63OD

Receiver-Yamaha RX-V379

HDMI Cables - Stouchi Ultra High Speed HDMI

Based on spec sheets, all are 4K HDR and HDCP 2.2 compatible. I'm using the ARC ports on the TV and receiver. I also have an Apple TV 4K on the same system, and 4K continues to work as normal.

I've made 2 calls to tech service, each time getting the standard "solutions" (tighten cables, refresh box, unplug box), with no success. On both calls, I was advised that my issue was going to get elevated troubleshooting, and I would receive a call within 24 to 48 hours. I'm now going on 120 hours and 72 hours from each call, and I'm still waiting.....

I'd really like some help here.