The earliest recollection of this bug is traced back to PAN-OS 10.1.0 - May 06, 2026. Local Log Collectors for Panorama management servers in active/passive high availability (HA) configuration cannot be added to the same Collector Group ( Panorama Collector Groups ). Workaround: Before you upgrade your Panorama servers to PAN-OS 10.1.0, configure HA ( Panorama High Availability ), add the local Log Collectors of the HA peers to the same Collector Group, and upgrade to PAN 10.1.0. For more information: https://docs.paloaltonetworks.com/pan-os/10-1/pan-os-release-notes/pan-os-10-1-0-known-and-addressed-issues/pan-os-10-1-0-known-issues https://docs.paloaltonetworks.com/pan-os/10-2/pan-os-release-notes/pan-os-10-2-0-known-and-addressed-issues/pan-os-10-2-0-known-issues