We use firebase (fcm) to send notifications to iOS users. The application runs in the application store and has active users. Push notifications worked, but suddenly stopped when we changed our APN certificate and uploaded it to FCM. After this certificate, all push notifications stopped on iOS devices, and fcm just returns the error message "internal server error". Now we are in a very bad position and we will be grateful for any help in this matter. Thanks in advance.
source
share