Hello,

We have developed a service that sends messages to Instagram accounts using the Instagram Messaging API.

However, we've encountered an issue where some Instagram accounts return the following error when we attempt to send messages:

{
    "code": 200,
    "errorSubcode": 2534067,
    "fbtraceId": "AqO9souuWCem_ne-EIH0j6P",
    "message": "(#200) Instagram送信API用に十分なInstagramのアクセス許可の詳細なスコープがアクセストークンにあったか、またはIGSIDが有効かご確認ください。",
    "type": "OAuthException"
}

OR

{
    "message": "(#200) Please check if the access token has sufficient IG permissions with granular scopes for sending API requests, or if the IGSID is valid.",
    "type": "OAuthException",
    "code": 200,
    "error_subcode": 2534067,
    "fbtrace_id": "AouX27HuHoQBu65bb6rBUal"
}

We use a single, fixed Instagram account to send messages, and the recipient Instagram accounts are all configured to allow messages from other accounts. Most of these accounts successfully receive messages, but some encounter the above error. Additionally, some accounts initially receive messages but later start returning this error.

I suspect this might be a mechanism by Meta to prevent spam, or it could be a bug on their side.

Please let us know if you're experiencing the same issue.