Note: There will be a confirmation email sent to you as part of enabling your account. You will need to click on the link in the email to continue the registration process. In order to be sure you receive the email please add firstname.lastname@example.org to your allowed addresses before completing this registration. Then after submitting this registration you should receive the confirmation email shortly. If you do not receive the confirmation email, please check your spam folder and if not there please email email@example.com.
Also see Adding addresses to Safe Senders list for more information from Microsoft on this topic to make sure you receive the confirmation email. Thank you!