All users must create a free Naxos student account to log in and use the Naxos Music Library mobile app.
From Naxos Music Library:
Accessing via the Libraries’ link and signing up with your eku.edu email address tells Naxos your account should have access to the Libraries’ subscription.
This account association with EKU will only last for 6 months and needs to be renewed by logging in via the Naxos website. For more information, please see the documentation on Naxos Music Library.