def METHOD_NAME(recipient_lookup):
    # Test for UEI
    recipient_parameters = {
        "recipient_name": "Child Recipient Test Without ID",
        "recipient_uei": None,
        "parent_recipient_uei": "123",
        "recipient_unique_id": None,
        "parent_recipient_unique_id": None,
    }
    expected_result = "b2c8fe8e-b520-c47f-31e3-3620a358ce48-C"
    assert obtain_recipient_uri(**recipient_parameters) == expected_result