After resetting your identity password you may be required to re-autheticate with applications.
Skype for Business or OneDrive
After you have reset your password, restart your device so the password can replicate with the servers. This should allow you to enter the new password and access the applications.
After restarting your PC, Outlook will prompt you to update your password. If you have, any functional accounts connected to your email it will ask you to authenticate to these.
Outlook may prompt you to do this a few times for each account as it authenticates with multiple servers.
Outlook app for mobile devices
If the outlook app does not accept your password, delete the app and reinstall it using your UniversityID@anu.edu.au (make sure you do not include uds in the address) and your new Identity password.