Set up email in Outlook for iOS mobile app
Download Outlook for iOS from the iOS App Store and then open it.
If it's your first time using Outlook for iOS, enter your full email address, then tap Add Account.
If not, open the Menu > tap Settings 
> Add Account > Add Email Account.
Enter your email account password and tap Sign In.
If multi-factor authentication is enabled, verify your identity.
Accept any prompts for permission you may receive.