Unfortunately, I do not see in the request logs from the messenger (https://onebox.spacehall.com.ua/admin/shop/report/logs/facebook-messenger) a parameter transfer file (in particular, a confirmation token).
I recommend that you contact Facebook technical support to clarify what the error is related to and why parameters are not being passed in the request (maybe something has changed).
Or maybe the problem is related to the problem here https://crm-onebox.com/en/support/messengers_and_chats/9315-perestali-prihodit-soobshcheniya-iz-fb-mesenzhera/
the same problem, the url is registered https://crm.apelsin.net/messenger/push/ maybe the url has changed? Error Validation of the callback URL or confirmation token failed. Confirm the provided information or try again later.
the same problem, the url is registered https://crm.apelsin.net/messenger/push/
maybe the url has changed?
Error
Validation of the callback URL or confirmation token failed. Confirm the provided information or try again later.
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