Hi,
I have private messaged you, but I also wanted to provide my response here in case other users are following along.
Change of Interest emails go out to contacts whose list subscriptions change. The email will only go out if the opt in source is set to "ACTION_BY_CONTACT". This is how the system was designed, because in theory, anyone could be changing another person's interests by entering their email address into an online form, so we notify them.
If you are changing their list subscriptions, you can set the opt in source to "ACTION_BY_CUSTOMER" to stop the change of interest emails from going out.
Best Regards,
Shannon W.
API Support Specialist
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