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New Samsung phones block sideloading by default
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
This is only for phones that come with One UI 6.1.1 by default and there's a page during OOBE setup with a toggle for this "feature".
An update to your existing phone will not turn on this block, it's only for new phones.
Ty, cleared it up right away.