I posted this on another thread on WPMU DEV – Thought I’d repost here in case anyone lands here. My Forms are working again….
Thank you, Michael Beddows! My forms are working again.
I created a new API key on MailChimp (not sure that was necessary).
I added a new email to my list (even though I had others already on my list).
Entered new API in Hustle – Reactivated the Hustle pop-up & widget.
Now (fingers crossed it lasts), I was able to use the form. I tried on different browsers to be sure and added fake names. Thanks again!
Here is the link to the thread where Michael Beddows gives his fix – click here.