Merge pull request #71488 from EricPonvelle/OSDOCS-9559_OIDC-Note

OSDOCS-9559: Added OIDC provider note to prereqs

Author: EricPonvelle

rosa_planning/rosa-cloud-expert-prereq-checklist.adoc

@@ -28,10 +28,15 @@ This is a high level checklist and your implementation can vary.
 Before running the installation process, verify that you deploy this from a machine that has access to:
 
 * The API services for the cloud to which you provision.
-* Access to `api.openshift.com` and `sso.redhat.com`.
+* Access to `api.openshift.com`, `oidc.op1.openshiftapps.com`, and `sso.redhat.com`.
 * The hosts on the network that you provision.
 * The internet to obtain installation media.
 
+[IMPORTANT]
+====
+Starting with version 1.2.7 of the ROSA CLI, all OIDC provider endpoint URLs on new clusters use Amazon CloudFront and the link:http://oidc.op1.openshiftapps.com/[oidc.op1.openshiftapps.com] domain. This change improves access speed, reduces latency, and improves resiliency for new clusters created with the ROSA CLI 1.2.7 or later. There are no supported migration paths for existing OIDC provider configurations.
+====
+
 == Accounts and CLIs Prerequisites
 
 Accounts and CLIs you must install to deploy the cluster.