HomeKit on Apple Watch - "No Response"

Thank you for your response. That does not resolve my issue. When I open the Home app on the Apple Watch, all of the devices say "No Response." The devices in the Home app on the iPhone show nominal status and function correctly. Something is still amiss between the two devices. Have even unpaired and reset up the Apple Watch as if it were new. Problem persists.

Additionally, I see the Home app among the apps on the iWatch. However, the Home App does NOT appear in the list of apps in the Apple Watch app on the iPhone. Seems odd. Also, in the bluetooth settings in the Settings app on the Watch, the iPhone is not listed as a connected BT device, yet in the Settings app on the iPhone, the Watch DOES show as connected. Again this seems odd.

Thank you again. Following are the actions I have taken, all resulting in no change; problem still exists. Since I've spent a couple-plus hours trying different troubleshooting steps, I do not feel like "Get Support" will help. Am hoping what follows here points you to an "ah-ha" revelation. 

• Home app - Deleted & reinstalled on iPhone 12 & as a result same occurred on the iWatch 5;
• Philips Hue app - Deleted & reinstalled on iPhone 12;
• Philips Hue Bridge - Power cycled;
• Philips Hue app - Reset to remove devices from HomeKit. Devices were removed from HomeKit on iPhone & Apple Watch (after a few seconds). Reestablished/Re-synched light bulbs in the Philips Hue app with HomeKit on the iPhone. Bulbs reappeared in HomeKit on the iPhone and on Apple Watch. The devices in HomeKit on the Apple Watch continued displaying "No Response."
• A Philips Hue lightbulb - deleted & re-added - had to do through Philips Hue app since HomeKit has to go through Philips Hub
• Ubiquity Dream Machine Managed network switch & WAP - restarted
• Philips Hue Essentials app - installed on Apple Watch. Can control lights in that app. Devices show in HomeKit again with "No Response."
• LiftMaster Garage Door bridge & opener app, iPhone - Same situation. Controlled via MyQ app outside of HomeKit. Appears in HomeKit on iPhone & works. Appears on Apple Watch & same problem - "No Response."
• LiftMaster Garage Door app, iWatch - installed on Apple Watch. Can control door via app, but continue to get "No Response" for that device in HomeKit on the Apple Watch. Yet, When a status change occurs, say the door opens, I'll get a notification on the iWatch. But still not control or see status on the iWatch.
• Lightbulb name - if I change it in HomeKit on the iPhone, the change occurs a few seconds later on the iWatch, but still "No Response" status. If I press on the lightbulb in the HomeKit app on the iWatch, it just shrinks momentarily two times.
• HomeKit, iWatch - sees the 2 Apple TV 4s with no error message, but sees the Philips Hue bulbs & motion sensors, and the LiftMaster garage door as "No Response." Confirmed they are all on the same network.
• S/W versions:
  • Philips Hue Essentials, iPhone: v4.0.3 (8370) (Released and updated a few days ago)
  • Philips Hue Bridge: 1.45.1945091050
  • Philips Hue Essentials, iWatch: v1.16.2
  • myQ Garage & Access Control, iPhone: v5.184.0.25262
  • myQ Garage & Access Control, iWatch: v5.183.0 (released 3 days ago)
  • HomeKit, iWatch: v = ?
  • HomeKit, iPhone: v = ?
  • iPhone 12 Pro OS = v14.6
  • iWatch 5 = v7.5 (18T567)
  • Apple TV 4 (Set up as HomeKit hub) = v14.6 (18L569)

Thank you in advance again for your assistance.