How to get around block of unknown apps when "unknown sources" is enabled?

Question

I just bought a Samsung Galaxy Tab A and I want YouTube Vanced on the tablet. But it won't let me install it because it's an "unknown" app.
Yes, I have enabled "unknown sources" and it still won't let me install the app.



A side note it's not blocking only YouTube vanced, it's blocking all unknown apps.



What can I do to get around this?



Here's a screenshot of the message:



IMG:


— Sal | Sources

Answer

I turned off Play Protect & went to Settings > Security > More Security Options and cleared the credentials and was able to successfully install YouTube vanced and other apps!


— Sal | Sources

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