Your customer acquired their Gen10 Plus servers through HPE GreenLake last year.

 To add HPE GreenLake for Block Storage to an existing HPE GreenLake account, you need to provide some basic information to the wizard-driven application in HPE GreenLake Central.  According to the HPE GreenLake for Block Storage Getting Started Guide 1 , you need to enter the following information:

Site contact info : This includes the name, email, and phone number of the person who will be the primary contact for the site where the block storage service will be deployed. This is required to ensure smooth communication and coordination between HPE and the customer.

Subscription term : This is the duration of the contract for the block storage service, which can range from 12 to 60 months. This is required to calculate the monthly billing and the minimum committed capacity for the service.

The other options are not required for the wizard. Reserved capacity is the amount of storage capacity that the customer wants to reserve for future use, which can be adjusted later. HPE customer ID is a unique identifier for the customer, which is already associated with the existing HPE GreenLake account. Datacenter address is the physical location of the datacenter where the block storage service will be deployed, which is already known to HPE from the previous HPE GreenLake service.  References:

HPE GreenLake for Block Storage Getting Started Guide

HPE GreenLake for Block Storage planning overview