We got this message from our admins about the Tomcat we are running.
**Update the AJP configuration to require authorization and/or upgrade the Tomcat server to 7.0.100, 8.5.51, 9.0.31 or later**
Everything points to z.QuickStart for Tomcat 8.5.6, but the message says we are not or is there something we have to update in Tomcat?
The original person left and I'm new to this. Thanks in advance.

I suggest that should check with your admins to see why they think that you are not running 8.5.6.