I am setting up a Form via our Wordpress plug-in, but it is not allowing me to assign sign-ups to a specific list (it only has the option for 'Allow subscribers to select from lists'), and then it's not even giving the option for sign-ups to pick a list, and is then showing up with the error message: "We had trouble processing your submission. Make sure you haven't changed the required form ID and try again."
Please help! We are launching the page Tuesday so I need to figure this out ASAP!
I apologize you are encountering this issue.
Here is a workaround we have found resolves issues similar to this one
So glad that we were able to help! Have a great day.