Gytis RepečkaAndroid "advanced flow" for sideloading "unverified" apps explained to @arstechnica by Android Ecosystem President Sameer Samat 
When sideloading apps today, Android phones alert the user to the “unknown sources” toggle in the settings, and there’s a flow to help you turn it on. The verification bypass is different and will not be revealed to users. You have to know where this is and proactively turn it on yourself, and it’s not a quick process. Here are the steps:
- Enable developer options 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 tap to confirm you are not being coerced
- Enter 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 warnings and select either “Allow temporarily” (seven days) or “Allow indefinitely.”
- Check the box confirming you understand the risks.
- You can now install unverified packages on the device by tapping the “Install anyway” option in the package manager.
Not ideal, but that will work for me 