Panorama Settings - Auth Key XPATH/API

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Hi All,

I'm trying to automate firewalls getting added to panorama. I do know how to configure the panorama IPs already, on the firewall gui Device > Setup >Management > Panorama Settings

However, I can't find the xpath/api to add the Auth-Key. I looked on the "Preview Changes" before commit, Monitor > Logs > Configurations, Config Audit, tried to look for the equivalent cli command, there's nothing on the XML API either. Also I inspected the gui and got this itemid="$.panorama-servers.device-registration-auth-key" and tried to guess it for a bit. Does Palo Alto looks at this Q&A? What would be the proper way to escalate this to them? Please let me know if you can help and thank you for your time.