The only problem I can think of without looking directly in the form to see if this is actually the problem is the list setup. Usually when you create a list it is double opt in list meaning when you submit the form before you are added to the list you will receive email that you need to click on confirm that you want to be subscribed. So you must click the email that you get as confirmation before you are added to the list.
Or another solution here would be to go in the list settings and change this to single opt in so when people submit the form they will be added immediately to the list without any other additional actions needed..
The only problem I can think of without looking directly in the form to see if this is actually the problem is the list setup. Usually when you create a list it is double opt in list meaning when you submit the form before you are added to the list you will receive email that you need to click on confirm that you want to be subscribed. So you must click the email that you get as confirmation before you are added to the list.
Or another solution here would be to go in the list settings and change this to single opt in so when people submit the form they will be added immediately to the list without any other additional actions needed..