On March 29, 2021, token and certificate-based HTTP/2 connections to the Apple Push Notification service must incorporate the new root certificate (AAACertificateServices 5/12/2020) which replaces the old GeoTrust Global CA root certificate. To ensure a seamless transition and to avoid push notification delivery failures, verify that both the old and new root certificates for the HTTP/2 interface are included in the Trust Store of each of your notification servers before March 29.
Note that Apple Push Notification service SSL provider certificates issued to you by Apple do not need be to updated at this time.
I got this email regarding the updation of push notification certificates. I have configured FCM (Firebase) to send push notifications, using APNs Authentication Key. I didn't generate any certificates yet for push notification.
Do I need to change anything on my end?