February 2019
Xbox One currently does not have a prompt to sign into your EA account before you play. This is an issue as I can't get the twitch prime rewards, and ended up creating another account for receiving the rewards that might not be linked to my Xbox. It's possible that I already had an EA account before and created another one, but if so I should be able to log out of that one and log into the new one I made in order to still receive the rewards, right?
At least a prompt in the game would be incredibly helpful. I don't understand what business tactic it is to only allow you to sign into your EA account on your Xbox account directly through a game but it's incredibly frustrating.
February 2019
Sorry to hear that you are having issues @EethenXBOX.
You can simply unlink your account and then relink it using the steps in this help article: https://help.ea.com/en-us/help/apex-legends/apex-legends/apex-legends-and-twitch/
Darko