Synching Apple Watch to steps in Health App

I’ve been having problems with the Vitality app updating steps so I followed their instructions and deleted the steps data from the health app on my phone, rebooted everything, and all that’s happened is my Apple Watch is no longer linked to steps through the health app as one of the data sources although it still is to all the other metrics. I don’t know how to add the Apple Watch back to the steps sources. Any help appreciated!