If your organization integrates applications with Azure AD, you can manage those applications in EmpowerID, including deleting certificates for those applications.
Delete Client Secrets
Navigate to the Resource Admin application portal for your environment.
Select Applications from the dropdown menu and search for the application with the certificate you want to delete.
Click the Friendly Name link for the application.
Select Client Certificates on the application menu and then click Delete for the certificate you want to delete.
Click Delete to confirm your decision.