GraphAPI

https://graph.microsoft.com

Query Format:

GraphURL (Static) | Version (v1.0 or Beta) | Specific entity type/resource, such as users, groups, devices, etc. | Optional Odata query arguments: $filter, $top

https://graph.microsoft.com/v1.0/users?$filter=userPrincipalName eq 'bob@tenant.onmicrosoft.com'

Docs:

https://developer.microsoft.com/en-us/graph/docs/api-reference/beta/resources/intune_graph_overview

Graph Explorer:

https://developer.microsoft.com/en-us/graph/graph-explorer