@6294946 You are on 17.2 for the phone? I would download the beta app, it is unlikely to have issues.
Try two things, first disconnect the watch from the phone, forget the watch in the app and then forget the app in the watch.
Uninstall the app from the phone.
Download the beta app or if you prefer the store app. Repair the watch.
Sometimes for me the watch is not connected in the iPhone BT settings. if that occurs to you simply touch the watch in the BT settings and it should reconnect. I have reported this issue to Suunto.