I know this is mainly a Microsoft group but a lot of us use samsungs and there wearables so I wanted to share this.
It would seem the Samsung wearable app has a bug that means that any wearables, Galaxy Watch 4 in my case, that are connected to your samsung phone do not sync/connect after 23:59 31st Jan 2023. If you run the wearable app it just hangs whilst trying to connect to the watch. if you put your date back to the 31st Dec however you can connect again but will only work whilst you have the app running in the background and don’t force close it. Hopefully a bug fix imminent.