If you are using a Branded App on Apple devices, you might receive the following message from Apple Developer Relations:
What to do?
Luckily, you don't need to do anything. The OfficeRnD engineering team generates this certificate, and our automation system will handle it.
As long as you grant us all the required permissions and accept the latest Apple agreements, the certificate will be re-generated the next time we update your app to a newer version.
As it stands, push certificates are updated monthly. If a certificate has one month remaining, it will be re-generated automatically.
Moreover, even if the certificate expires, the app will remain in the App Store, and you will always be able to use it. However, push notifications won't be sent until the certificate has been regenerated.