I’d like to add, in general with rendering of DOM/interface, also always be mindful of the caching (and plugins that influence the caching and order of operations that compose the DOM).
Except that .one is a valid domain extension. Perhaps enable the addition of extensions/tlds to validate? 🙂
As a an advocate of PHP7, and newfound fan of Postman, I’d also like to know 🙂
Tried to install via web on a hosted WP 3.92 site and it worked and activated fine. Tried again on my local ready to go 3.92 prototype and it installed but failed to activate, giving same error.
Hope that might provide a clue. Let me know if you want more info.