The issues related to Epic players logging in to the North American and European PC/Mac megaservers have been resolved at this time. If you continue to experience difficulties at login, please restart your client. Thank you for your patience!
try clearing your cache, history and cookies or use a different browser
you should post stuff like this under "PC-Technical Support" then usually mods respond in a short period of time.
Try opening it in "In Private" mode. This will make sure you don't have any cookies saved such as those that block the site due to failing the age verification test.