The Interrail app says that the pass (a global one, in this case) is not valid from Feldkirch to Lindau-Reutin; the ÖBB app, putting in an Interrail pass as a discount, gives a price of €0.00 for the journey. Is it safe to assume that this is one of the Interrail app's not infrequent errors*, given that as far as I can tell it's an ordinary ÖBB service?
*Another for the same journey is that Liechtenstein isn't listed as a visited country on the map despite getting a train from Schaan-Vaduz; maybe they didn't bother to include it.
*Another for the same journey is that Liechtenstein isn't listed as a visited country on the map despite getting a train from Schaan-Vaduz; maybe they didn't bother to include it.