The most common culprit is trying to use a legacy key for a modern version.
To resolve the issue, try the following solutions: horizon connection server license key is invalid
VMware Horizon comes in tiers: Standard, Advanced, and Enterprise. Each requires a specific key. If an administrator upgrades the Connection Server software to a newer version but applies a license key for an older, incompatible edition—or attempts to use features not covered by the license tier—the validation logic may flag the key as invalid for that specific software build. The most common culprit is trying to use
The most common cause is the expiration of the license term. In a subscription model, if the contract ends, the key becomes invalid. Similarly, if an organization transitions from Perpetual to Subscription but attempts to use an old perpetual key on a version of Horizon that mandates subscription licensing (a change heavily emphasized by Broadcom), the key will be rejected. If an administrator upgrades the Connection Server software
To ensure the license applies correctly, the server must meet these baseline prerequisites: