Sorry, don’t know where to report bugs so will post it here.
In Windows, the Login function of the new Clockify Beta app doesn’t work.
The problem was because I had previously installed the old version and when installing a new one it doesn’t update its path in registry so when you try to log in from a browser, it doesn’t open a Clockify Beta because the path stays old.
To manually fix this problem you have to go to
HKEY_CLASSES_ROOT\clockify\shell\open\command (from the Registry Editor program) and update the path to your newly installed Clockify Beta.exe file.