DO Primary or Authorized user accounts work to boost credit score?

Whome22

New member
I know FICO supposedly implemeted "new" rules recently, but I have read mixed things about this.

Will any primary or Authorized USer accounts boost scores.
any reputable place to attain them?
I was curious because a friend and I were in debate about credit scoring and he brought the issue of primary and authorized accounts up.
 
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