Error message on pop-up sign-up form

Hey there!

I’m setting up an email flow/campaign so that people who sign-up to join our Hash Lab, then become apart of the list/segment “Hash Lab Members” in Klaviyo, but I’m having some trouble getting it to work. Essentially, what I want is for those people who sign-up using the pop-up sign-up form on our homepage to then be added to that members list so we can then use a targeted welcome series of emails to welcome them to the exclusive club. This then, will become a mailing list that we’ll send content to via emails. 

I’ve set up the list, the sign-up form, and even the subscription pages.

However, when I tried to sign-up  myself on mobile, I receive the error message below (see screenshot). When I tried to sign-up on desktop, I was sent to my success message, but I can’t see in Klaviyo where my email went. I’ve scoured the help center and the community for answers, and I’m at a loss.  I’m hoping someone can help me figure out the flow, and why I’m receiving this error message. 

Thank you!