missing client token on unwrap, hvac 0.6.4, vault 0.11.3.

unwrap failure

def get_vault_token(vault_rolename):
    # get role id from vault-tower
    role_id_json = requests_wrap.get_data("{}{}/{}".format(vault_token_tower, "/roleid", vault_rolename))
    role_id = role_id_json['role_id']
    print("roleid: {}".format(role_id))

    # get secret wrap from vault-tower
    wrapped_token_json = requests_wrap.post_data("{}{}/{}".format(vault_token_tower, "/wraptoken", vault_rolename))
    wrapped_token = wrapped_token_json['wrap_token']
    print("wrapped token: {}".format(wrapped_token))

    # unwrap token to get secretid
    # FAILS HERE, line 14
    unwrapped_secret_id = vc.unwrap(wrapped_token)
    print(unwrapped_secret_id['data']['secret_id'])
    print("Secret id: {}".format(unwrapped_secret_id))    
    
Output
======
Connected to pydev debugger (build 181.5540.17)
roleid: cd9f0825-1315-0a56-8012-e03bb412b417
wrapped token: 6cJDiW0FbWjXKp3mmmPIxPed
Traceback (most recent call last):
  File "/home/username/apps/pycharm-2018.1.2/helpers/pydev/pydevd.py", line 1664, in <module>
    main()
  File "/home/username/apps/pycharm-2018.1.2/helpers/pydev/pydevd.py", line 1658, in main
    globals = debugger.run(setup['file'], None, None, is_module)
  File "/home/username/apps/pycharm-2018.1.2/helpers/pydev/pydevd.py", line 1068, in run
    pydev_imports.execfile(file, globals, locals)  # execute the script
  File "/home/username/apps/pycharm-2018.1.2/helpers/pydev/_pydev_imps/_pydev_execfile.py", line 18, in execfile
    exec(compile(contents+"\n", file, 'exec'), glob, loc)
  File "/home/username/gitrepos/torrent9scraper/downloader.py", line 167, in <module>
    token = get_vault_token(config.get('vault', 'role_name'))
  File "/home/username/gitrepos/torrent9scraper/downloader.py", line 125, in get_vault_token
    unwrapped_secret_id = vc.unwrap(wrapped_token)
  File "/home/username/gitrepos/torrent9scraper/venv/lib64/python3.6/site-packages/hvac/v1/__init__.py", line 216, in unwrap
    return self._adapter.post('/v1/sys/wrapping/unwrap', json=payload).json()
  File "/home/username/gitrepos/torrent9scraper/venv/lib64/python3.6/site-packages/hvac/adapters.py", line 103, in post
    return self.request('post', url, **kwargs)
  File "/home/username/gitrepos/torrent9scraper/venv/lib64/python3.6/site-packages/hvac/adapters.py", line 233, in request
    utils.raise_for_error(response.status_code, text, errors=errors)
  File "/home/username/gitrepos/torrent9scraper/venv/lib64/python3.6/site-packages/hvac/utils.py", line 29, in raise_for_error
    raise exceptions.InvalidRequest(message, errors=errors)
hvac.exceptions.InvalidRequest: missing client token