I don’t know if you have since resolved your issue but I had the identical issue and just resolved it.
I noticed that my email templates in the menu OPTIONS/SUBSCRIBE2 were blank. It was these blank emails that were being sent.
I then noticed that at the bottom of the page there is a button called “RESET”. I pressed this and the templates refreshed only now they contain the required text. The emails are now sent out and are no longer blank and better still they correctly send out the confirmation link.
Hope this helps you.
