I seem to have locked myself out of Samsung Knox (on a Galaxy Tab S2 - I've used [tag:samsung-galaxy-tab] because there doesn't appear to be a tag for the S2 tablet yet).

I hadn't used my tablet for awhile. I turned it on and updated to the latest version of Android.

I had a notification asking me to load the Google Play store to update that as well, and after clicking this notification, at this point, the device locked with the Samsung MyKnox login screen.

I did originally set up Knox but haven't really used it since.

I tried both my device password and my Knox password, but these both came back as incorrect.

I'm able to log in to Knox online with my Knox password, so I followed the instructions [in this answer](https://android.stackexchange.com/a/142444/160779) (which are the same as the ones Samsung offers), but it's unclear what I'm meant to do: after clicking on 'Rest KNOX Password' on the web and confirming that action, nothing happens - either on the web or on my device.

On my device, I can pull down the notifications, but pressing the Home button does nothing - it seems to want me to get past this Knox screen.

I'm inexperienced with Knox and a bit inexperienced with the Android ecosystem in general. Have I locked myself out? What steps do I need to take?