Hi Jon,
I'm still not able to do this. See the list design snapshots from my response on 2016-02-10 12:57. I was questioning the list design for the Key earlier, but we ended up looking at another potential related issue with the server and then you did some troubleshooting with Jon Sasano. I don't see any "Auto-Increment Integer" option anywhere in the list design. Actually, I looked for something like that a whole back and don't see anything that resembles that option. Also, as you can see from my snapshot, there is no option for me to specify a non-integer Key....it is grayed out and not letting me choose.