Thanks for your quick reply. Acutaly we are using an Azure web app service and the push is send direktly without firebase or push notification hub from azure. We only hosting the webservice not the full server. In that case I guess Azure (microsoft) should updated the Certificates on her own? I already tried to send a push notifitcation via https://api.development.push.apple.com:443 to our app and it worked. But i was not realy sure if there any think else then to do. Thanks Lathan