Apple iOS
Step 1 (iOS): Download Outlook from the App Store
You can also download the Outlook app from the App Store and then add your account following the same steps as for an Android device.
...
Step 2 (iOS): Alternative, Using Mail App
Follow the pictured steps to add your account via the Apple Mail app.
Go to your device’s Settings, scroll down to Mail > Accounts > Add Account.
Select Exchange.
Enter your Office 365 email address, password, and a description of your account. Tap Next.
If you’re prompted to enter server settings, enter the following and tap Next. Email: your full email address. Server: outlook.office365.com. Username: your full Humnet username. Password: your email password.
The Mail app may request certain permissions such as accessing your calendar and contacts. To agree, tap Yes. Then choose the apps you want your email account to sync with your iOS device and tap Save.
Now you’re all set to go!
...