Have lost the companion app from Apple watch

Checked my Apple Watch today and discovered the companion app is no longer on my watch. Not sure when it was removed. I attempted to remove and reinstall the companion app on my phone and have not had the app appear on my watch. Anyone have this happen and get a fox for it???

Yes, support for the Apple Watch has ceased. Well it did a while ago but now the app has been removed in the last week or so.
There’s an app called Heartcast that works.