If you have trouble with smart home bubbles not always working here are two expert options on the watch which might help:

Force HTTP via phone = even if the watch has its own internet connection, the app will send the HTTP command using the companion app on the phone

Smart Home debug messages = the watch will display server response and error messages after issuing HTTP commands (only if not routed via the phone… but this might give you an idea why the watch is unable to send it. I suspect there is some extra firewalling happening in the implementation of network in Wear OS. Some commands work, others don’t, that’s why I ended up adding the Force via phone option)

I hope this resolves the issue for you.