Plugin not work

for some days the plugin seems to no longer work. when I send the message the spin turns to infinity and the message is not sent. in the search console I find this error:
/ wp-json / contact-form-7 / v1 / contact-forms / 9218 / feedback? _locale = user: 1 Failed to load resource: the server responded with a status of 401 ()

while in the json of / wp-json / contact-form-7 / v1 / contact-form / I find:

{"code": "forbidden_access", "message": "", "data": {"status": 403}}

what could be the problem?