Thank you for explaining. Since you have their information already you could register them yourself, one by one through the registration page. You would want to be sure that they had intended to register for your webinar otherwise, they may complain about the email. Another option would be to email them directly, acknowledge their interest and provide them with the webinar registration link.
Since we did not create the Leadpages integration I am not sure why it may have failed for these registrants, but you may be able to find help here:
https://support.leadpages.net/hc/en-us/articles/212740878-Integrate-GoToWebinar-with-Leadpages
Glenn is a member of the LogMeIn Community Care Team.
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