release_ids_filter returns zero responses

Running the below request:

releaseid_split='1,2,3'

def approvers(self):

return self._release_client.get_approvals(project=_project,release_ids_filter=releaseid_split)

Where I am passing in the release ids the results are always null in the above method call on the requests class unless blank data is sent through.

Running this via a request you get data back data as I would expect:
requests.get(f'https://vsrm.dev.azure.com/{ORG}/'+_project+'/_apis/release/approvals?api-version=5.1&releaseIdsFilter='+releaseid_split, auth=('', TOKEN)).json()

The same response just via a different means returns data as expected with the correct release data.

Is there something I am missing?

_release_client.get_approvals から始め、その release_ids_filter リクエストを、issue に示されている直接の requests.get 呼び出しと比較します。release ID 1,2,3 を指定した場合と空の入力の場合の両方で、2つの呼び出しを再現し、その後、client が直接のリクエストと同じ release approval データを返すことを確認します。