A2A client version 4.5.3 is not getting registered with UAT appliance running with .3.4.5.
However A2A client version 4.12 getting registered successfully.
Release : 3.4
It was found that PAM appliance 3.4.5 uses tls 1.2 while this version of the agent 4.5.3 does not use TLS 1.2 While the 4.12 A2A agent does.
Allowing TLS 1.1 until agents are upgraded allowed for the 4.5.3 agents to register to the 3.4.5 PAM appliance.