Android Device Manager "An error occurred"

I tried using CM13 about a week ago and ended up not liking it and wanting to go back to stock. When I tried to restore one of my backups Twrp kept failing to restore data so I figured I'd reflash the stock rom entirely and start fresh and new. After doing so however, Android Device Manager can't sign in. It just says "an error occurred, please try again" which is so helpful. I did try once a day and it hasn't worked still. Tried clearing a bunch of data on various Google apps/frameworks but get nowhere. I just tried flashing a backup of the complete stock OS (I had to factory reset when I originally rooted it, so when I got TWRP installed I backed up the OS having technically never used it) and it still gives me that useless error message. I've tried revoking all device rights on my Google account but can't seem to get anywhere. Now the web version just mocks me and says "You have no Android devices. Buy one."

Any thoughts?

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