If you already have your LSUE email account set up on your phone, you will have to remove the account and then add it back. For the best experience, Microsoft recommends using the Outlook mobile app, which is available within your phone’s mobile app store by searching for “Outlook mobile app”. If you prefer to utilize the built-in email client on your phone, this is an option also.
How to set up your account in the recommended Outlook mobile app
How to set up your account in the Mail app
How to set up your account in the recommended Outlook mobile app