JavaScript based tracking (check the Statify settings) should work with password protection as well. The hit is counted by an Ajax call when loading the webpage after entering the password. You can check the source code of the page (Crtl + U) and search for the Statify script to verify everything works as intended.
We have already enabled JavaScript based tracking. There are two options here: 1. JavaScript based tracking with nonce checking or 2. JavaScript based tracking without nonce checking. We have tested both and still get no results.
Can it be that it is due to the Password Protect plugin “Password Protected” from WPExperts?
you can check the source code of the page to see whether the Statify JavaScript is actually included and executed? In the Network tab of the developer console of your favorite browser you should see an Ajax request being executed after the page is loaded.