On attempt to login into WordPress admin interface with correct permissions redirected to
wp-login.php without any error messages.
This behavior was considered as internal software issue with ID PPA-2621. The fix for this issue is considered to be included in on of the PA future updates.
As possible temporary workaround for this issue switch Preferred Domain name under
Customer's Control Panel > Websites Tab > domain.tld > Hosting Settings
domain.tld instead of