We are using the default subscription center in Dynamics that has the default subscription center form. The form has an email address field and a submit button. The form is hosted on our site.
The problem is, there are other ways that we get notified that someone wants to unsubscribe. They either send an email request or people will ask on behalf of someone else. If we visit the page with the subscription center on it—and not from the link in the email—the form never loads. I'm assuming that this is because the form doesn't know the identity of the person attempting to unsubscribe because they got there in a different way.
Is it possible to allow anyone to unsubscribe from the form?