M365 copilot error Connection lost.

We recently upgraded our FortiGate firewall firmware from version 7.6.6 to 7.6.7.

After the upgrade, we started experiencing issues with several applications, including WhatsApp Web, Canva, Figma, and Microsoft 365 Copilot. Users receive the following error message:

"Please check your network and try again."

As part of our troubleshooting, we manually added the required FQDNs to the SSL/SSH Deep Inspection profile within the security policies. However, Microsoft 365 Copilot is still not functioning properly.

Could you please advise on any additional configurations, known issues, or recommended troubleshooting steps for resolving this problem?