How come not all the Azure fields below are showing in the Get User (see second image) action fields?

How come not all the Azure fields below are showing in the Get User (see second image) action fields?
The Azure AD Connector documentation outlines all of the available defintions. If you don't see the definitions you require, they may be available via Graph API. To get started, check out this post by @sergeluca, Extend Microsoft Flow with the Microsoft Graph.
If more Azure AD functionality is something that you would like to see added to Flow or a Flow Template, please consider submitting it to the Flow Ideas page, where it can be voted on by other users, and tracked and commented on by the Flow team.
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