The Forum does not recognize my username and password. Why can't I login to the game forum?
When you register for the game you only receive an account for the game itself. This means you will need to register for the forum separately. When registering you will need to use your game credentials (username and password) in order to create your forum account.
You can register forum account using this page: https://en.forgeofempires.com/start/ForumAccount/