Step 1 – Click on Settings from your iPhone Home Screen

Step 2 – Click on Passwords & Accounts

Step 3 – Click on Add Account

Step 4 – Click on Exchange

Step 5 – Enter your Email Address, Description and click on Next

Step 6 – Click on Sign In

Step 7 – Enter your email address and Office 365 Password

Step 8 – Click on Save Password and then Accept

Step 9 – Click on Save