I found the following in the log, which may be relevant:
15:04:20.198 [main] ERROR com.jamfsoftware.jsam.invitation.CliMain - Did not obtain an enrollment invitation.
com.jamfsoftware.jsam.invitation.JsamInvitationException: Unable to parse response from JSS.
at com.jamfsoftware.jsam.invitation.InvitationCommClient.unusualResponseException(InvitationCommClient.java:129)
at com.jamfsoftware.jsam.invitation.InvitationCommClient.readResponseContentFromInputStream(InvitationCommClient.java:114)
at com.jamfsoftware.jsam.invitation.InvitationCommClient.getResponseContent(InvitationCommClient.java:100)
at com.jamfsoftware.jsam.invitation.InvitationCommClient.getCommResponse(InvitationCommClient.java:79)
at com.jamfsoftware.jsam.invitation.InvitationObtainer.obtainInvitationFromCommClient(InvitationObtainer.java:36)
at com.jamfsoftware.jsam.invitation.InvitationObtainer.getInvitation(InvitationObtainer.java:28)
at com.jamfsoftware.jsam.invitation.CommandLineProcessor.processForReal(CommandLineProcessor.java:59)
at com.jamfsoftware.jsam.invitation.CommandLineProcessor.process(CommandLineProcessor.java:31)
at com.jamfsoftware.jsam.invitation.CliMain.processCommandLine(CliMain.java:73)
at com.jamfsoftware.jsam.invitation.CliMain.main(CliMain.java:41)
Caused by: com.jamfsoftware.communication.exceptions.JAMFCommunicationParsingException: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2 path $
at com.jamfsoftware.communication.JSONMessageMarshaller.createJAMFMessage(JSONMessageMarshaller.java:43)
at com.jamfsoftware.jsam.invitation.InvitationCommClient.readResponseContentFromInputStream(InvitationCommClient.java:112)
... 8 more
Caused by: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2 path $
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:220)
at com.google.gson.Gson.fromJson(Gson.java:879)
at com.google.gson.Gson.fromJson(Gson.java:817)
at com.jamfsoftware.communication.JSONMessageMarshaller.createJAMFMessage(JSONMessageMarshaller.java:41)
... 9 more
Caused by: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2 path $
at com.google.gson.stream.JsonReader.beginObject(JsonReader.java:387)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:209)
... 12 more
Did not obtain an enrollment invitation. Unable to parse response from JSS.
I have the same issue.... Ever get this fixed?