Android setup requirements and tasks for common Office 365 apps.
By using the Outlook for Android you can access your email, calendar, contacts, and OneDrive files from within the app rather than having to check separate apps:
If you synced your calendar and contacts in Step 5, you can go to those apps on your phone to view any items that might be there. If you synced tasks as well, you should see them in the calendar app on your device. It might take a few minutes for everything to sync.
If your device can't connect make sure you typed your email address and password correctly and try again. If you still can't connect, try setting it up manually on Step 3: