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Hi @littlesofia,
Are you currently using the ConvertKit for WooCommerce plugin? If so, would you mind sharing their response with us? I should clarify that this plugin isn’t one of ours, and our support policy doesn’t typically cover third-party plugins.
However, as the opt-in checkbox feature is a part of their plugin and seems to be malfunctioning, they should help resolve the issue instead of redirecting to us. It would be best to reach out to the plugin’s developers again for further assistance here. I am sure they will have no problem supporting you there.
I hope this provides some clarity. Please let us know if you have any other questions!