Just wanted to share my personal experience with ticket gates on my interrail trips so far.
This post is inspired by the earlier question regarding the gates in spain for trains without reservations (Cercanias)
Italy open with the QR-Code from your Interrail Pass but only once a day at the same station? (maybe it is also a shorter time frame, just personal experience and not official info)
Switzerland The only gates i encountered were at the cable car from Lauterbrunnen to Grütschalp and to my surprise the interrail Pass QR code worked. (Surprising because i dont think any other routes that accept interrail in switzerland have ticket gates)
Netherlands Turning off NFC can be required for regular PDF-Tickets (The interrail app automaticly turns it off while the QR Code is displayed so you dont get that problem with Interrail) (In my case the NFC Ticket from Paris subway was most likly interfering)
But i dont remember having problem on my way back from the netherlands where i used interrail.
France I think i encountered gates at the station in Nice ville but everything worked with the ticket from the Interrail app. I also encountered gates at other stations but there i had a reservation (mandatory on all TGVs) to open them.
