I understand that you are facing an issue with push notifications not being delivered to iPhone devices in your app since January 12, 2024, at 4:05 AM (Japan time). You've confirmed that the APNS authentication key is still valid, and the key itself is correct. Additionally, you mentioned that push notifications are working fine on the sending device. Despite resetting the authentication key, the problem persists, and you haven't received a specific error code; instead, you are getting a general error message. To troubleshoot and resolve this issue, you may want to consider the following steps: Check for Apple Server Status: Ensure that Apple's push notification servers are operational. Sometimes, server outages on Apple's end can affect push notification delivery. Review Apple Developer Console: Double-check the Apple Developer Console for any relevant messages or issues related to your app and push notifications. It might provide additional insights into the problem. Check Device Settings: Confirm that the affected iPhone devices have proper network connectivity and are not in a "Do Not Disturb" mode. Also, ensure that the app's notification settings on the user's device are configured correctly. Review Payload and Certificate: Examine the payload of your push notifications and ensure that it complies with Apple's guidelines. Additionally, verify that your app's push notification certificate is still valid. Update to the Latest SDK: Make sure that you are using the latest version of the SDK provided by Apple for handling push notifications. Contact Apple Developer Support: If the issue persists, consider reaching out to Apple Developer Support for further assistance. They may be able to provide specific insights into the problem and guide you through the resolution process. Implement Logging: Introduce logging mechanisms in your app to capture more detailed information about the push notification process. This can help you pinpoint the exact stage where the issue occurs. Network Firewall and Proxy: Check if there are any network firewalls or proxies that might be blocking the communication between your server and Apple's push notification servers. Remember to document any additional information or error messages you receive during the troubleshooting process, as these details will be helpful when seeking assistance from Apple or other developer communities. If the problem persists, seeking professional assistance or consulting with Apple's technical support may be necessary. 【Message content】 Auth error from APNS or web push Service

I hope this message finds you well. I am writing to bring to your attention a persistent issue that we have been experiencing since January 12, 2024, at 4:05 AM（JPN）. It appears that push notifications are not reaching some iPhone devices in our user base. We have taken the following steps in an attempt to resolve the issue: 1.Checked the notification settings on the affected iPhone devices to ensure that the app is allowed to receive notifications. 2.Verified that the app is updated to the latest version on all affected devices. 3.Restarted the devices to rule out any temporary glitches. 4.Uninstalled and reinstalled the app on the affected devices. 5.Ensured that the devices have a stable internet connection via Wi-Fi or mobile data. Despite these efforts, the problem persists. We suspect that there might be underlying issues related to the push notification service or other technical aspects. Could you please assist us in investigating and resolving this matter? If there are specific logs, error messages, or any guidance you can provide, it would greatly aid our troubleshooting process. Our users greatly depend on receiving timely notifications, and we want to ensure that the service is working seamlessly for everyone. Any insights or assistance you can provide to resolve this issue would be highly appreciated.