Microsoft Graph API- count all users with license

I'm trying to query Graph to get all users that have a specific license.

I have the following data:https://graph.microsoft.com/v1.0/users?$select=id,assignedLicenses

{"@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users(id,assignedLicenses)","value": [        {"id": "6e7b768e-07e2-4810-8459-485f84f8f204","assignedLicenses": []        },        {"id": "87d349ed-44d7-43e1-9a83-5f2406dee5bd","assignedLicenses": [                {"disabledPlans": [],"skuId": "c7df2760-2c81-4ef7-b578-5b5392b571df"                }            ]        },        {"id": "5bde3e51-d13b-4db1-9948-fe4b109d11a7","assignedLicenses": [                {"disabledPlans": [],"skuId": "90d8b3f8-712e-4f7b-aa1e-62e7ae6cbe96"                },                {"disabledPlans": [],"skuId": "725422ed-e205-400e-ab0a-3899d8a398ca"                },                {"disabledPlans": [],"skuId": "c7df2760-2c81-4ef7-b578-5b5392b571df"                }            ]        }    ]}

My end goal will be to count all users with this license: "c7df2760-2c81-4ef7-b578-5b5392b571df"but as a start i'm trying to just get a list with all these users.

But when making this call:https://graph.microsoft.com/v1.0/users?$filter=assignedLicenses/any(a: a/skuId eq 'c7df2760-2c81-4ef7-b578-5b5392b571df')

i'm getting the following exception:

{"error": {"code": "BadRequest","message": "Invalid filter clause","innerError": {"request-id": "9a4837b1-cbcf-4c0b-a54e-168959aeb4d8","date": "2019-08-12T07:47:12"        }    }}