@CloudMe , there are no granular permissions available neither for the delegated permissions set nor for the application permissions set to query specif attributes of a User's object.
In case you want only to list out a certain attribute value of an User object making a graph call, that you can do, by providing proper query parameters in the graph api call like $select.
Hope this helps. Do let us know if there are any queries around this so that we can help you better.
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