It doesn't work with Dropbox due to security issues (Not a Xerox decision), so I don't believe it will with Office365 either, but as I don't have an account to test with, I can't actually verify it will/won't.
If it can be done, it will be as I stated, which won't apply to the admin only, it is more "the admin account is the only one that can save the login"
This is how you set the App Gallery to always use the same account and never prompt for instance.
The App Gallery forum admins/mods are much more knowledgeable on these matters so their answers will be the ones to go with.