I am the admin/owner of a private domain and I've started using Outlook.com as our email client for running a non-profit event. Now some of our email accounts need to be accessed by multiple users and I've noticed that a lot of the accounts are looking for verification. Will this affect other users logging onto the account once someones phone number has been used? Also once verified it doesn't seem to unlock features straight away. How long does it take to verify the account?

Is there any option to give more control of this to myself, the administrator of the domain or disable it? 

Thank you for your help