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Hi @sercoccia,
Thank you for writing in,
To authorize all domains, you need to make the whitelist domain empty. If you enter any email domain, the form will only accept submissions from that domain. For example, if you added a gmail.com domain to your white list, that domain will be accepted on your registration form.
Since you are using the premium feature and according to the WordPress Support community guidelines, we can not provide premium support here because this support forum is for free plugin users.
Would you kindly check out You will find the live chat option to contact our support representative.
Regards!