On 1099-r line 12 where do yo get the Arizona State/Payer's state no.?

It should be included on the 1099-R form. 

Start by putting AZ in the "State" box.  If the Payer's state number is not on the form, contact the issuer of the 1099-R  or check their website.

It's actually box 13:
<a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/f1099r--2018.pdf">https://www.irs.gov/pub/irs-prior/f1099r--2018.pdf</a>