WORKAROUND
In TPAM versions 2.5.920 and below, only one syslog server may be configured.
STATUS
The ability to add more than one syslog server was added in TPAM 2.5.921 via Enhancement Request #8851
From the TPAM 2.5.921 Release Notes "General Enhancements" section:
"Can configure up to three syslog servers."