Unlocking Not Working

I bought my Nexus 6 through AT&T last November. It is paid off and I am in my normal right to unlock. I requested my code from AT&T, but it doesn't work when entered. Anyone else experience this? I get the unsuccessful error upon entering the code.

I do have the boot loader unlocked, customer Kernel, and root. Does this make a difference and potentially could be causing my issue?? Any other solutions?

Thanks