I'd assume that a workspace server (owned by the user you're authenticating as) is what's actually used for reading the filesystem-based files that store the STP code you're trying to package up, rather than a STP multibridge session (owned by ie. sassrv). This means that the identity you authenticate with for the export must have sufficient credentials registered to start up a workspace server session with the OS, similar to what it'd do in EG.
Are you authenticating with an @saspw account? If so, is it capable of spinning up a session at the operating system level?
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