No permissions for REST API in project created through TVB Web interface

Toni reported a problem:

• he created a new project using the GUI at FRH and uploaded some datatypes inside it
• then, he logged in by REST client and tried to access the data in that project, using: get_datatypes_in_project
• he received this exception:

  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
    File "//anaconda/envs/frompypi/lib/python3.8/site-packages/tvb/interfaces/rest/client/tvb_client.py", line 156, in get_data_in_project
      return self.project_api.get_data_in_project(project_gid)
    File "//anaconda/envs/frompypi/lib/python3.8/site-packages/tvb/interfaces/rest/client/client_decorators.py", line 63, in decorator
      raise ClientException(error_message, response.status_code)
  tvb.interfaces.rest.commons.exceptions.ClientException: You cannot access this resource