AARP Cruise on board credit program

[GeeBarbie777]

Has anyone booked a cruise through the AARP website?
I recently (8/11/2022) booked using AARP and the links sent me to an Expedia-AARP site. The specials were great with a promotional "Up to $100 on board credit". I've been checking on what the processes is to redeem this credit (what is the process once on board, do I need any documents? A redeem number? PIN number?) and so far I've not found anyone at AARP or Expedia that knows a thing about this. 
Has anyone had any experience with an AARP booked cruise with an on board credit promotion?

[AARPThelmaG]

Hi @GeeBarbie777  To learn more, please call the AARP Travel Center Powered by Expedia for assistance with booking at 1800-675-4318. Members receive up to $100 in extra onboard credits on select cruises to the Caribbean, Alaska, Europe and more. Please follow applicable state, CDC and WHO guidelines.