Suddenly we started to get this error on the api calls:

{ "error": { "message": "(#135000) Generic user error", "type": "OAuthException", "code": 135000, "error_data": { "messaging_product": "whatsapp", "details": "Generic user error" }, "fbtrace_id": "AIvFn3LZUcQzc0NnTZ4GJGz" } }

When trying to send messages using Marketing templates.

Any idea of what can be happening? All was working well until yesterday...