Additional meeting and call-related features and issues within Microsoft Teams for Education
Hello VIKAS BHANGDIYA,
Thanks for your post in Microsoft community. Regarding your issue, could you please let us know how have you invited attendee in a live event or have you invited any skype, skype for business user in your live event? Your brief detail helps to narrow down the issue.
Also we suggest you during such meeting, please download attendee’s report and check if you are able to find users name or email id which match with such live:.cid. To download attendance report, please check steps mention here. (Keep in mind that you'll only be able to download the attendance report while the meeting is in progress and participants are still present.)
Thanks and regards,
Ankita Vaidya