Subscription Coverage

Hi, there.
I already have a paid subscription to MuseScore, and now I want to install a second copy on my phone, so that I might look things up during practice (e.g., do you even have a lead sheet for something that I can access, or do I have to write one out?).
However, when I try and install the Andoid version on my phone, even though it initially recognizes me, it won't let me proceed without creating a new account. Is this a bug, or is this by design? It's annoying enough that I have to keep answering 100 questions any time I have to reinstall the software, but do I really have to have a separate subscription for an Android copy to use?

Thanks