Which line at the airport should my parents take when entering with IR5 immigrant visa (merged)

[calberry 18]

My parents are arriving with their immigrant visas this week and on the "USCIS Immigrant Fee payment receipt" receipt it says:

 

Quote

Confirm Your U.S. Mailing Address To Receive Your Green Card

Now that you have paid your USCIS Immigrant Fee, USCIS will prepare to mail your Green Card to the U.S. mailing address you gave the Department of State (DOS) at your visa interview. To ensure that we send your Green Card to your correct address, create a USCIS Online Account to verify or update your U.S. mailing address.

 

Create a USCIS Online Account: https://my.uscis.gov/uscis-immigrant-fee/verify-identity

 

We created USCIS accounts using the link above but we couldn't figure out a way to verify the mailing address. The verify identity link loops back to the login page and for the "Add a case to your account" link we have the IOE number and A# but we don't have an online access code (OAC). Will it be possible to verify the mailing address for their green cards when my parents go through immigration at the airport or is there another way?

 

Edited July 31, 2023 by calberry
fixed broken link

[Ontarkie 14,217]

~~Additional questions merged into ongoing topic.~~