Despite the “Solved” label https://community.eurail.com/topic/show?tid=9661&fid=40 the trains are still not bookable in the rail planner app. According to support a new release should have been launched last week resolving this issue.
Solved
Swiss Thurbo trains still not bookable via Rail Planner App
Best answer by BrendanDB
Did you check if you have the latest verson of the app?
As there is official confirmation of both Thurbo and Interrail that passes are valid, you always can add the trip manually.
Reply
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.