How to query a user based on extensionAttributes?

Question

I want to query a user by the value of extensionAttribute1 but I'm getting this error: "Microsoft.Graph.Models.ODataErrors.ODataError: Property 'extensionAttribute1' does not exist as a declared property or extension property." When I go to my own user in Entra, I can clearly see my extensionattributes are filled in:

This is the code I'm using to make the request:

UserCollectionResponse? response = await _graph.Users.GetAsync(requestConfiguration =>
{
    requestConfiguration.QueryParameters.Filter = "extensionAttributes/extensionAttribute1 eq '<MY-VALUE>'";
    requestConfiguration.QueryParameters.Count = true;
    requestConfiguration.Headers.Add("ConsistencyLevel", "eventual");
});```

Answer 1

Hi @Brecht Ghijselen

It should be onPremisesExtensionAttributes attribute instead of extensionAttributes.

It is working for me:

Hope this helps.

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Answer 2

Graph refers to these as onPremisesExtensionAttributes: https://learn.microsoft.com/en-us/graph/api/resources/onpremisesextensionattributes?view=graph-rest-1.0

So you need to use the correct filter:

GET https://graph.microsoft.com/v1.0/users?$filter=onPremisesExtensionAttributes%2FextensionAttribute7 eq %27IsManager%27&$count=true