The officeatwork input field 'Office 365 Users' is based on the Microsoft Graph Office 365 Users endpoint. The properties of this source are static and limited. If you are missing some properties, you can extend your directory with your extensions (properties). Typically this could be used for things like preferred user language, initials, etc. Learn more about how to create directory extensions.Once you have created additional properties in your directory, you can make them available in your officeatwork 'Office 365 Input Fields'. As this is a preview feature, you need to contact your officeatwork specialist to do this for you. For the activation of the additional properties, we need to know the exact name of the extension attribute. You find a guide on how to get the name here.Once this feature becomes publically available, we will allow organizations to register their extension properties using our officeatwork Admin Center.Please be aware that (during this private preview phase) you need to trigger a re-calculation of existing Office 365 Users input fields to get the latest lists of extension properties. The easiest way to do this is to click into the name field of your Office 365 Users input field.