TurboTax Import of Vanguard 1099-R--No Document ID on Vanguard 1099-R

I suspect I am missing something simple here but when I go to download our Vanguard 1099-Rs in TurboTax I am asked by TurboTax for the "Account Number" and "Document ID" on the Vanguard 1099-R. I did this for our taxable brokerage accounts without issue, but the Vanguard 1099-Rs we have do not have a clearly stated "Account Number" or "Document ID".

What am I missing here?