You will encounter error 244 when logging into Guild Wars Reforged with an ArenaNet account that has Guild Wars 2 but no associated Guild Wars Reforged account.
Playing on PC:
Please select "Create Account or Add Access Key" from the login screen and select "Create a new Guild Wars account." Then, input your Guild Wars Reforged serial key. When prompted to set an email and password for the account, please enter the same credentials you use for your existing ArenaNet/Guild Wars 2 account.
Playing on Mobile:
Please create a new account using the login method for your platform (Apple or Google.)
After you create this new Guild Wars Reforged account using your mobile platform account, you can link it to your existing ArenaNet/Guild Wars 2 account, after which you can use your original ArenaNet login credentials. You will also gain access to Hall of Monuments rewards.
If this does not resolve the issue and you still experience Error 244 when attempting to login, please check the additional troubleshooting steps for the error in this article.