Because email addresses are hidden in the MasonLive directory unless the student gives permission for it to be shown, some applications that allow for sharing may not work as expected, if at all.
If you're experiencing an issue collaborating while using any of the MasonLive Office 365 services, you may want to consider having your account made visible in the MasonLive directory. It would be up to the students you are sharing with, if they want to make their accounts visible.
Virginia House Bill 1 (HB1) which took effect July 1, 2018, requires students to give consent for their email address to be shared. For more information on the law, or to update your consent status, please visit the Office of University Registrar's HB1 Guidance page.