How can I allow a second user account to unlock my device after a reboot?
So I had the same problem with an employee to whom I had given a phone. She kept forgetting to charge the phone, so when it rebooted after charging she had to hand me the phone so I could type in the password and then switch to her secondary account. Tired of this, I read some articles about multiple users. I couldn't find the right answers (or didn't understand them) but here is what I did.


I switched to her user account and protected her user screen with a swipe.
Rebooted
In my admin account, I erased/disabled my screen lock by erasing my admin password.
Rebooted
In my admin account, I enabled the screen lock again by using a password. The phone then prompted me to accept added security by needing a password before startup. This time I chose NO. Then I re-added my old password.
Now after reboot, my employee can swipe the screen down and select the second user herself without having to input the admin password. And if she tries to switch to my admin account, the phone asks for my password.


I really don't know how vulnerable the phone has become after declining the added security, but now I can get back to work faster and have one less thing to worry. 

I hope someone still finds this helpful.