O365 Login from iPhone
You will be redirected to the Okta login page in the picture below. You will then use your same login information to proceed through the Okta Login process by entering your login and password. (Username: Example@domain.com / Password: typically, your domain password)
Please note your security image will be the one you selected originally and not of the one below.
Once successfully logged in you will be prompted to accept the following permission listed in the picture below. Once accepted you will be ready to use your email.