yes, you are right
2021-12-24 04:03:24 WARNING (MainThread) [homeassistant.helpers.service] Unable to find referenced entities switch.1000a8327f_1
But the same switch is working fine from the web ui
hmm maybe you have an old entity to clean up?
I found this article , WearOS - Ewelink addon switches: Unable to find referenced entities switch.xxx · Issue #1954 · home-assistant/android · GitHub
I think this is my issue
looks like theres a work around for it on there 
Hi there,
What an amazing feature for all smartwatches users !
In my case (Fossil Gen5 + Android 11), the app only works when the watch is connected over wifi. But as soon as the watch is connected over BT, the app doesn’t work anymore.
Am I missing something ?
Only some users mention this issue impacts them. When a wear device is connected via BT the data is proxied through the phone. Some users mentioned they had to remove trusted networks and trusted proxies configuration. This is most likely a network configuration issue on your end.