“Subscriber not found error” when adding contacts to a list via button click

[User]

Hi there,

I am having a widespread issue with the buttons in my newsletters: when I configure a button with a standard link it works perfectly, but the moment I enable the option to “add contact to a list” upon clicking, the button completely breaks and throws the error Subscriber not found or not confirmed.

This error happens both in edit mode while designing the campaign and to real users when they receive the email, and it occurs regardless of the language or list selected (even if the lists are public).

I need to know how to fix this so the button can successfully add people to the list and redirect to the website at the same time without throwing this subscriber error.

Thank you!

[Author]

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