Hi @Eduardo001
We uncerstand your concern. you can create multiple accounts with truekey but inorder to activate the premium account please follow the below steps.
Login to home.mcafee.com> Sign in with your McAfee credentials > you see an activation code under true key> you can use the activation code to activate your subscription.
Please refer the below article that has inforamtion on how to activate truekey to premium.
My License for True Key is Basic rather than Premium
There is no possible option to use the auto fill feature using same google accounts
Regards
Magesh J