Re: I can't claim the Apex Legends Prime Loot. I've just didnt get it.
Hi @Bartozo14
Take a look at this EA Help topic https://help.ea.com/en-us/help/apex-legends/apex-legends/apex-legends-and-twitch/#unlink
Plus a couple of posts which may help you from other forums users:
"You need to confirm if you linked a correct EA account to your twitch
To see what is the EA account linked to your console, you can follow this step
1. Go to https://help.ea.com/en/
2. Click Log in (New log in window will pop up)
3.At the bottom of sign in page, you will see 3 options to sign in "Facebook, PSN, xBox Live" - Sign in using your console account (Sony or Microsoft account)
See this photo: https://imgur.com/a/qXt9QuS
4.Click "ACCOUNTS" and Select change email address (You will see what is the correct email address / EA account linked to your console)
If you link your Twitch account to a wrong EA account, you can still un link, check the process here: https://help.ea.com/en-us/help/apex-legends/apex-legends/apex-legends-and-twitch#unlink"
And another one:
If you don't get a login prompt, you already have an account connected.
You can log into into https://help.ea.com/en/ via the Xbox/PS4 login options. Once you're logged in here you can go to Accounts > Order Management, and it'll try to transfer you to the main ea.com site, and on this page you should see the email address for the linked EA account.
You can log into Origin.com then go to your profile (in the bottom left) then Edit on EA.com (in the top right). On this page you can scroll down and see your linked accounts. 
If you already linked Twitch to the wrong account, you can unlink it, then link the right account, using the steps here: https://help.ea.com/en/help/apex-legends/apex-legends/apex-legends-and-twitch/
Good luck!