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I can't find a way to edit Zoom meeting registration form. Is this just valid for Webinars?
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Welcome to the Zoom Community, @Marmott.
The only "customization" for a meeting registration email is for the confirmation email, which has limited places where custom text can be entered (yellow highlighting):
See How to customize registration emails in this document for details:
https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0065026