Under what condition must an appliance license be reactivated?

While licenses are often reactivated during RMAs due to hardware changes, software upgrades are also a common condition requiring license reactivation, making this statement's exclusivity incorrect.

F5 BIG-IP licenses are often tied to specific software versions and entitlements. Performing a major software upgrade (e.g., from one major software branch to another) typically necessitates reactivating the license to update the license file and ensure all licensed features and the base software version are correctly supported on the upgraded system.

Adding new features typically requires a license upgrade and reactivation to enable those specific entitlements, but software upgrades themselves can require reactivation even without new feature additions.

This is incorrect; BIG-IP licenses are not permanent across all software versions, and they often contain version-specific information that requires updates during upgrades.