OSDOCS-11152 Update to prereqs for configuring email notifications

Author: laubai

modules/managed-cluster-add-notification-contacts.adoc

@@ -12,8 +12,8 @@ By default, only the cluster owner receives cluster notification emails. You can
 
 .Prerequisites
 * Your cluster is deployed and registered to the {hybrid-console}.
-* You are logged in to the {hybrid-console-second}.
-* The intended notification recipient has a user account on your cluster.
+* You are logged in to the {hybrid-console-second} as the cluster owner or as a user with the cluster editor role.
+* The intended notification recipient has a Red{nbsp}Hat Customer Portal account associated with the same organization as the cluster owner.
 
 .Procedure
 . Navigate to the Clusters page of the {hybrid-console-second}.
@@ -27,3 +27,11 @@ By default, only the cluster owner receives cluster notification emails. You can
 
 .Verification steps
 * The "Notification contact added successfully" message displays.
+
+.Troubleshooting
+
+The *Add notification contact* button is disabled::
+This button is disabled for users who do not have permission to add a notification contact. Log in to an account with the cluster owner, cluster editor, or cluster administrator role and try again.
+
+Error: `Could not find any account identified by <username>` or `<email-address>`::
+This error occurs when the intended notification recipient is not part of the same Red{nbsp}Hat account organization as the cluster owner. Contact your organization administrator to add the intended recipient to the relevant organization and try again.

modules/managed-cluster-remove-notification-contacts.adoc

@@ -13,7 +13,7 @@ You can remove notification contacts in your cluster support settings to prevent
 
 .Prerequisites
 * Your cluster is deployed and registered to the {hybrid-console}.
-* You are logged in to the {hybrid-console-second}.
+* You are logged in to the {hybrid-console-second} as the cluster owner or as a user with the cluster editor role.
 
 .Procedure
 . Navigate to the Clusters page of the {hybrid-console-second}.