Keeping Restricted accounts logged in after Restart

[AC Question]

I am the owner / administrator of 15 Samsung Galaxy Tab E tablets (Model SM-T377V) which are all running Android 6.0.1. I have created a "Restricted Account" on each device and have limited that user to a few specific apps. The owner (me) and the restricted account (workers) have separate PINs for logging into the devices. Here is the issue: When the device is logged into "Restricted Account" ("Settings" > "Users > "Restricted Account") all is well until the device is shut down. Once turned off manually or by battery loss, the next boot-up defaults back to "Owner" mode. How do I keep these devices in "Restricted Account" mode until the User is purposefully switched manually in Settings? Thank you - William