survey report can not identify user?

Hello,

Yesterday, I held a webinar for the first time. I prepared a survey, and some users answered it.

However, when I look at the survey report, I see that the user ID, user name, and email address are not included. Although there are spaces for this information in the report, it says "no name."

I am very confused because I need to identify the users who answered the survey to inform them.

Please tell me how to identify the users who answered the survey.