Add Office 365 email account to iPhone

Go to your iPhone or iPad's Settings > scroll down and tap Accounts & Passwords > Add Account.

Select Exchange.

Enter your Microsoft 365, Exchange, or Outlook email address and a description of your account. Tap Next.

Tap Sign In.

Enter the password associated with your email account. Tap Sign in or Next.

The Mail app may request certain permissions. Tap Accept.

Choose the services you want to sync with your iOS device and tap Save.

The email account is now added to your iPhone.