What follows is the "advanced flow." I feel like there should be a class action lawsuit in response to this as when I purchased my device I had an expectation that I could install apps without this insane limitation

    Enable Developer Mode ↗ by tapping the software build number in About Phone seven times

    In Settings > System, open Developer Options and scroll down to “Allow Unverified Packages.”

    Flip the toggle and answer a scare screen confirming that you are not being coerced

    Enter your device unlock pin/password

    Restart your device

    Wait 24 hours

    Return to the unverified packages menu at the end of the security delay

    Scroll past additional scare screen warnings and select either “Allow temporarily” (seven days) or “Allow indefinitely.”

    On the next scare screen, confirm that you understand the risks.

    You can now install unverified packages on the device by tapping the “Install anyway” option in the package manager.