To access your Workspace email from your iPhone or iPad, you can use the Outlook app. The Outlook app is compatible with any device running iOS 8.0+.
You must have IMAP-enabled Workspace email to use the Outlook app. If you are not sure what kind of account you have, read this: POP or IMAP: How do I know what type of account I have?
If you selected Notify Me, tap OK on the pop-up notification.
That's it. You're done! You should see your inbox in the app and be able to send and receive email.