I have a mobile interrail pass. I booked eurostar tickets and other reservations on my ipad using the website and then realised I had to use that app on my phone so transferred my pass to my phone. I then added my trip using the app on my phone. I already have the tickets. Will they still be valid.
I have not activated my pass yet as I am not travelling until 7th September.
I hope you booked pass reservations instead of tickets. The pass is your ticket.
In any case, it doesn't matter how and where you book your reservations. They're not tied to your pass (usually only to your name, but sometimes not even that) and their validity does not depend on the device where you booked them. You could even book reservations at a ticket office, it doesn't matter.
The best overview of where to book pass reservations is this page:
https://www.seat61.com/interrail-and-eurail-reservations.htm
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