The app is on the watch, everything else works, but the complication stopped and was showing 40 degrees for three days. I could still tap and access the app data.
I checked complications and that corner of the face said it was off. Searching for the complication, it was nowhere to be found. Is it really gone?
I had a similar problem. I deleted the app from my phone and reinstalled the app on the phone and the watch. After logging in the complication has worked well.