Multiple users per SUP app on same device

We're developing a custom written iOS native app, using MBOs and SUP 2.2.2....

Our use case requires devices (and applications) to be shared. Does this in and of itself violate any licensing agreement? If not, how are others handling this from a technical standpoint. The app has to be registered to a single user, but how to authenticate other users? We can challenge them for credentials, and ideally would like to use AD as the source, avoiding the need for yet another password.

Would love to hear from olthers who have similar requirements, and hear how you solved the problem, in terms of development, application flow, etc.

Thanks