Changed from Meeting to Webinar and Registrants Did Not Receive Email with new/updated Webinar Link

Hello, 

We changed a meeting to a webinar and did not want people to have to re-register themselves. So we imported names and emails to the webinar and zoom was to send the email with the updated webinar link to each registrant. However, we are receiving so many emails from people stating that they did not receive the webinar link. Can anyone please advise if there is a solution for this or something we can tell people to check? Apparently nothing shows up in spam/junk folders for them either.

Thanks