Pending Clean Up
ISSUEA common reference (i.e Common:WebUr) resolves to the default URL, when a workflow is started from a site that is accessed via an alternative access mapping (AAM)
RESOLUTIONNintex Workflows need an additional parameter so that they are aware of what AAM to use for the common reference.
In order to do this, add an additional Zone via the the NWAdmin AddZoneSetting, see the following document for further details:
Under section Addzone.