Thanks, installing that version 4428139 worked.
As I had uninstalled the app, I needed to re-verify it. I got that done by installing Vivaldi, and copying its .desktop file to ~/.local/share/applications/open-url.desktop and adding %U to the exec line, like @cy8aer detailed in his post about the default browser. At that point it got the verification URL open on the browser, and I was able to use “Mobiilivarmenne” to identify myself.