Still shooting in the dark but found this very recent post on reddit,
“Reset the watch and unpair it using the crown and power button. When it’s ready to be paired click on the I for more info on the watch and make sure the country and time are set to the correct one to match your iphones. Then go and pair again via the app however when it’s complete do no touch the watch just click ok on the iPhone. Then go and download the WatchOS6 beta profile install and let the watch restart. It’ll work fine now. Hope this helps

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And this similar post,
1. Reset you AW to factory settings (press and hold "digital crown" and tap "reset").
2. Change your region to USA, and language to English (if it not) on AW (click "i" button).
3. Change your Region to USA and language to English on iPhone.
4. Pair and synchronise your AW.
5. DO NOT CLICK "DIGITAL CROWN" when synchronise finished. Click "OK" button on iPhone, then download watchOS 6 beta profile again. Activate it.
6. Your AW will reboot.
7. Now you can click "Digital Crown" on the AW and BE HAPPY.
Note: In my post above, I did forget to mention to reinstall the watch beta profile after a full factory reset.