meraki-cloud-controller traffic being identified as unknown-udp for port 9351.

• Session details (show session all) showing unknown-udp for meraki-cloud-controller on port 9351.

admin@FW> show session all

--------------------------------------------------------------------------------
ID          Application    State   Type Flag  Src[Sport]/Zone/Proto (translated IP[Port])
Vsys                                          Dst[Dport]/Zone (translated IP[Port])
--------------------------------------------------------------------------------
67           unknown-udp    ACTIVE  FLOW       10.11.239.250[51625]/VW-Trust/17  (10.11.239.250[51625])
vsys1                                          a.b.c.d[9351]/VM-Untrust  (a.b.c.d[9351])

• Traffic logs (GUI: Monitor > Logs > Traffic) also display the application as unknown-udp.

• Palo Alto Firewalls
• PAN-OS 9.1 and above
• meraki cloud controller Application

1. The issue is fixed in content version: 8711-8058
2. Update the content version to fix the issue.
3. As a workaround before content update, one can create a port based security rule to allow destination port 9351.

• meraki-cloud-controller is used for management, optimization, and monitoring Meraki wireless LAN, which can be an infrastructure AppID.
• meraki-cloud-controller uses these standard ports -->  30001,32768-61000,443,7351,7734,7752,80,9350,9351,993,tcp,udp.

Refer:

• What Apps And Services Are Used For Meraki-Cloud
• Set-up Cisco Meraki Cloud For Integration