No subject

could be quite wrong on this) the licenses are node locked to the server
they were installed on. During the registration / activation process, it
communicates this info to a central server somewhere. This prevents the
same key from being used twice. You need to explain your situation to
Digium and request a new activation key.

Support may be able to help you determine which key ins installed on
which server.

AFAIK this is all due to the closed-source registration app from
VoiceAge - many have expressed concerns about it, and apparently this
app has problems with some SCSI based systems (reports on it working in
a SCSI only system are sketchy.)