I just faced this problem.. i turned on my VPN last night and a pop up told me to change my lockscreen settings to either password or fingerprint (I'm using Samsung Galaxy Note 4), so i did. Ever since that, I cant change my lock screen settings back to none.. i have tried deleting all my VPN. I have tried to choose the Clear Credentials option but its grayed out. I have tried entering my google account at the forgot password section on the lockscreen but it shows that i had entered incorrect username or password (but I'm sure of my google account email and password). So what else can i do?
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1did you try your google login at a different machine? just to make sure you're not hacked. Also see android.stackexchange.com/questions/22867/… – jiggunjer Nov 23 '15 at 1:23
Are you using Android for Work? Try this:
- Go to Settings > Security > Device administrators
- Deactivate the entry that has installed security policies
- Now go back and see if you can change your screen lock settings
