Microsoft Graph user endpoint does not return otherMails-property

Question

I'm trying to get the property otherMails when searching for users like this:

https://graph.microsoft.com/v1.0/users?$filter=startswith(givenName, 'anna')&$select=displayName,otherMails

However, the response does not contain otherMails:

{
    "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users(displayName,otherMails)",
    "value": [
        {
            "displayName": "Anna Karenina",
            "otherMails": []
        }
    ]
}

The user has the property set in Azure AD:

What am I doing wrong? According to the documentation, this property should be returned on $select: https://docs.microsoft.com/en-us/graph/api/resources/user?view=graph-rest-1.0

A list of additional email addresses for the user; for example: ["[email protected]", "[email protected]"]. NOTE: This property cannot contain accent characters. Returned only on $select. Supports $filter (eq, not, ge, le, in, startsWith).

Answer 1

To be able to read otherMails you need to add User.Read.All permission which allows the app to read the full set of profile properties, reports, and managers of other users.

Resources:

User permissions