Question: how to add jhmi email to iphone?
Answer: Go to Settings -> Passwords & Accounts.
Click Add Account.
Click on Exchange.
Enter your JHEDID and add @jh.edu (e.g., jdoe55@jh.edu) Important: Do not use @jhu.edu here to sign in. ... 
Click Sign In when you receive a pop up.
Enter your JHEDID credentials on the JHU single sign-on page.