If you haven’t already done so, be sure to plan to upgrade to HCL Traveler version 12.0.1 FP2, which includes Apple Push Notification Service (APNS) p12 certificates updated through September 2023. These certificates replace the files that shipped with version 12.0.1, which expire in December 2022.
Version 12.0.2 will, of course, include the updated certificates as well and will be released during November.
Documentations LINK
Using Apple Push Notification Service (APNS) mode for auto sync LINK