I upgraded to v1607 and lost my PIN sign-in option.
I went to go add my PIN back and the "Add" button did absolutely nothing (spinning dots for a few seconds then nothing after).
I looked elsewhere on this site and it said to delete the contents of the NGC folder, so I did that too. That did not solve the problem though, the button still does nothing.
I also tried deleting the NGC folder itself, and the same behavior persisted.
I changed my account to a local account and tried to add a PIN that way. Nothing happened after I put in my local account password.
Changing back to a Microsoft account prompts me to add a PIN, but when I try to set up a PIN, it shows "Something went wrong. We weren't able to set up your PIN."
Changing my password on the Microsoft account lets a dialog box appear when I click the "Add" button, but after I sign in with my Microsoft account password, nothing happens. I go to click on the "Add" button after this, and it still does nothing.
Restarting my computer / waiting for about 30 minutes or so while logged in, lets the dialog appear, but the same behavior happens as described in the aforementioned paragraph.
Re-verifying my device with my Microsoft account also does not change anything.
Using another account on the computer does not make it work either.
The button in question:
Any help would be appreciated.