V20: Reassign unassigned PRO 4SC subscription to another self-hosted PBX ("Commercial Keys cannot be replaced")

[lsswiss]

Hi,

I have a licensing question regarding 3CX V20.

Current situation:

• I own two 3CX PRO 4SC subscriptions.
• Both subscriptions are registered under the same customer account (same company and email).
• One subscription was previously used on another self-hosted PBX for about one month.
• That PBX has been decommissioned.
• I have already released the FQDN, and in the customer portal the subscription now shows:
  • FQDN: "-"
  • Company: mine
  • Email: mine

The target PBX is also self-hosted and currently runs another PRO 4SC subscription, which expires in 5 days.

When I try to replace the license key, I receive:

Commercial Keys cannot be replaced

My goal is simply to reuse my own unassigned subscription on another PBX under the same customer account. This is not a transfer between different customers.

Questions:

1. Is replacing the commercial key on the existing PBX intentionally blocked in this scenario?
2. Is the only supported procedure to deploy a new PBX with the unassigned subscription and then restore a backup from the existing PBX?
3. After the current subscription expires, will the replacement become possible, or will the same restriction still apply?

Thank you for your clarification.

 

[bitn2]

1, yes
2. The only supported procedure is to deploy a new pbx with the new key. No restore or anything else.
3. no

You can modify the PBX backup associated with the expiring key to use the new one. However, this is not supported.