Thank you for reaching out to the Community! I'm sorry to hear your contacts are unable to register for your event. I understand how important it is for event registration to be a smooth process.
I definitely would like to take a look into this issue for you. Please email us at social_support(at)constantcontact(dot)com with your username, the name of your event campaign, error messages received (if any) and a reference to this post and we will investigate further!
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