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Additionally, the attachment-level `fallback` argument is missing in the request payload for a chat.postMessage call - To avoid this warning, it is recommended to always provide a top-level `text` argument when posting a message. Alternatively, you can provide an attachment-level `fallback` argument, though this is now considered a legacy field (see https://api.slack.com/reference/messaging/attachments#legacy_fields for more details).

The top-level `text` argument is missing in the request payload for a chat.postMessage call - It's a best practice to always provide a `text` argument when posting a message. The `text` is used in places where the content cannot be rendered such as: system push notifications, assistive technology such as screen readers, etc.