Could not reflect: requested table(s) not available in Engine

GRANT DBA TO DBACONSULTA
GRANT EXECUTE ANY EVALUATION CONTEXT TO DBACONSULTA
GRANT ANALYZE ANY TO DBACONSULTA
GRANT SELECT ANY TABLE TO DBACONSULTA
GRANT EXECUTE ANY PROGRAM TO DBACONSULTA

engine=create_engine('oracle+cx_oracle://...')
metadata = MetaData()
metadata.reflect(engine, only=['tablename'])

Could not reflect: requested table(s) not available in Engine