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When looking at the source of the form I see the email field twice, one time visible, and one time hidden. The form can’t be submitted because the email field (the hidden one) is a required field.
I see some CSS code in your theme that is specifically targeting our plugin and hiding the labels:
.mc4wp-form label {
display: none;
}
Try to remove the second field from the form on MC4WP > Form > Fields.
And maybe ask your theme developer to not hide the form labels.
Kind regards,