I cannot book to Strasbourg by the app or website. The app allows me to book to Basel SBB, but prompts me to use the website for international purchases. But the website is not allowing any purchases under my account anymore for some reason (the “Buy” text is in strikethrough, and before that it would flag an error message).
As recently as last month, I (and I assume most users here) was able to use SBB on both the app and website for purchases to and within much of Italy, France, Spain, etc.