It’s in beta. You’re in the beta section. Have you used the beta version of the Wyze app and put the beta firmware on the bridge and cam? The firmware notes are all detailed here.
After you do all of the above, go to the app and go to the “Account” tab at the bottom. Then, go to “Services” and “Green check” the camera you want Cam+ on. It’ll show a warning about not being supported but you can tap “ok” and then the green “Activate” button at the bottom. You’re now beta testing the feature.