Hi ​@alafayyad ,

Is it just one device, or all devices?
If all devices are affected, please check the Push Certificate (APNs).

Navigate to your Jamf Pro settings page, and take a look at the Push Certificates tab to see if it’s expired. 

If your certificate has expired, there should be a thirty-day grace period where you can still re-enable communication by uploading a push certificate. Ensure that the account you use for this is the same one that was used to set up the initial certificate, or you will need to re-enroll all your devices. 

If it is not your Push Certificates, then I would look to your Firewall rules. There have been some recent changes to the IP addresses of the servers Jamf uses globally, and you may be running on outdated rules which will block communication.

Push certificate not expired yet. I have opened a case with Jamf support and will have a remote session with them to try and solve the issue. Thank you all for your replies.

had something similar, we needed to update the whitelist on our zscaler and now all is perfect again