New Samsung phones block sideloading by default
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PSA: New Samsung phones block sideloading by default. Here's how to re-enable it
https://www.androidauthority.com/enable-sideloading-one-ui-6-1-1-3463446/
Auto Blocker stops apps from being sideloaded and is enabled on Galaxy devices released with One UI 6.1.1. Here's how to turn it off.