I have seen some older posts with no updates on this very subject so I thought I would start a new thread. I am testing SSL decryption from a couple of workstations and have almost all of the traffic being successfully decrypted. We are a Google suite user with it being our email provider with our own domain. I am on a mac and when using Chrome to access any of the GSuite apps, it is not being decrypted. The cert is showing up as a standard Google Trust Services issued cert instead of my Palo Alto issued cert.
I have blocked all QUIC traffic at the firewall per the Palo Alto published best practices. I have a security rule with any as the source, QUIC as the application and services as Application Default. Just to make sure something wasn't slipping past that rule I added another this morning blocking all udp traffic over 80 & 443 to no avail. The logs show tons of blocked QUIC traffic from my workstation. When I log into any of the GSuite apps from Safari, it is decrypted as expected.
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