The decision to upgrade PAN-OS has been approved. The engineer begins the process by upgrading the Panorama servers, but gets an error when attempting the install. When performing an upgrade on Panora

The GlobalProtect agent version on endpoints is not a direct factor in the successful installation of a PAN-OS upgrade on the Panorama server itself.

Outdated or incompatible plugins, such as Panorama plugins, content packs, or App-ID updates, are a frequent cause of failed PAN-OS upgrades on Palo Alto Networks devices, including Panorama. The upgrade process checks for plugin compatibility and will halt if these prerequisites are not met or if legacy plugins conflict with the new OS version.

Management only mode describes a firewall's operational role and does not inherently cause upgrade failures on Panorama.

Expired certificates might cause operational issues or communication problems, but typically not a direct failure of the PAN-OS installation process itself unless they are critical system certificates affecting OS integrity checks.