Hi Son, Sorry for the delay response. The Azara SKU are EOS as of October 15, 2017. ExtremeCloud partnumbers for 1yr, 3yr and 5yr subscription service for access points will available for ordering. You need to purchase one subscription service for your access point based on how many you wants to be support.
There is no PN as "37421" in ExtremeCloud.
Best regards,
Bin