WhatsApp checks every message to protect users from unwanted messages. Even if you’ve messaged a contact before, WhatsApp may still reject a message with a Healthy Ecosystem error. This can happen if the user doesn’t engage with marketing messages; WhatsApp may temporarily limit additional promotional messages from businesses.
Having a contact opted in means they have given you permission to receive messages. However, opt-in does not guarantee message delivery. WhatsApp still performs Healthy Ecosystem checks to protect users from unwanted messages and may temporarily limit promotional messages if the user isn’t engaging with business messages.
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