I bought my physical token when it was released for FFXI: never got any problem with it but a few years ago, the battery seemed weak so I installed the Android app.

I never had any problem with the app, even when updating my OS. However, I de-attached, re-attached the app several times (phone problems, phone changes) and it was always easy and smooth.

My wife has the ARR CE physical token: no issue either with this one.