where can I find and change the person who receives an e-mail about the renewal of a certificate?
In our case, the emails often go to the customers and are not noticed. This leads to a temporary system downtime (if the production tenant is affected).
The customer's contact IT persons who have subscribed on CSNS (it's an application named Cloud System Notification Subscription where user email addresses are maintained) for S/4HANA Cloud products should receive those automatic announcement notifications.
I hope it helps,
I hope the following SAP community blog will answer to your questions: