Hi Michel, my question was directed towards the OP regarding the issue just going away. Incidentally (or coincidentally), my ticket was updated shortly after my posting.
What I found to resolve my issue was deleting all of the nodeservers in polyglot cloud. After a small period of time, the missing ISY portal nodeserver returned in slot 1 and I was finally able to sync correctly with the ISY. I then re-added another nodeserver, and it synched correctly with my ISY.