am I doing something wrong. I am trying to send virtual sensors I created to HomeKit to get data from my water sensors to make the Bulldog valve shutoff.
Are you running HomeKit (HK) from your phone, or using a HomePod or AppleTV? If just from your phone - bear in mind I never operated w/o a HomePod as a Homekit hub - I think you need to insure both apps are running to be able to see each other (H.Elev. and HK apps). Even with an Apple hub, it can take a few minutes to see devices in HK which have been enabled by HE.
You can unlink and relink HK from the Hue Integration app (under Advanced, at the bottom of the app's screen).
I haven't had such trouble with it, so not sure what else to recommend. There's the insuring that your phone & hubs are updated, it's best to do with with HE connected with Ethernet, try to place the HE hub at least a few feet distant from your router & the apple hubs.