After upgrade Azure CSP from the version 3.x to 4.x the fields Notification Email Address and Notification Email Display Name are not available at the Initiate Configuration screen at RCP > Customer CP > Azure Pack Services. Previously (in Azure CSP 3.x) these fields were used to compose a From: field in notification emails sent from a reseller to customers.
How to set up a diplay name and sender e-mail address for notification in Azure CSP 4.x?
Since Azure CSP 4.x this functionality was moved to Notification Messages. The email templates with names like Azure CSP* can be customized at Provider Control Panel > System > Settings > System Notifications > Email Templates.
Read more about Notification Message Customization in the OA documentation.