The confirmations sent to Messenger are all saying, "Unsupported Attachment" and do not tell me anything. This started on September 1st, 2021, all previous messages worked fine. No idea what has changed to cause this problem. How can this be remedied?
I understand your concern regarding the message which you are receiving about attachment unavailable. Our relevant team is working on this issue and it will be resolved soon. We regret the inconvenience caused.