Using OneDrive on your Mobile Device:
BEFORE you download and attempt to use OneDrive on your mobile device you need to log in to Office 365 via a web browser and click on the OneDrive link in the top right hand corner of the page. You need to wait for it to finish initialising/set up the OneDrive. Once you have completed this step you can install on your mobile device.
Using OneNote on your Mobile Device:
To sign into the OneNote app you download onto your mobile device you need to use a Microsoft account (e.g. Live, Xbox, outlook.com etc). Once you have logged in with a Microsoft account you can add your Office 365 account by going to Settings > Accounts > Add a service/Office 365 account.
You will need to enter your Office 365 credentials (Username: email@example.com, Password: Unitec network password) and sign in.