Anonymous responses on Office forms: is there any way to have their email or name?

Hi Patrícia, if you adjust the Form settings this should be possible to capture name and email address, as shown on the 'Who can fill out this form" section:

"Two additional options are available if you choose to only allow people in your organization to fill out your form. Select Record name if you want each form response to include the name and email address of the responder. Clear this option if you want to allow anonymous responses to your quiz or form."

So this option isn't available if you want to allow anonymous responses.  You may have to check these settings, adjust them as needed and send out a new Form but see how you get on.

https://support.office.com/en-us/article/adjust-your-form-or-quiz-settings-in-microsoft-forms-f255a4ba-e03c-4e12-b880-f7e8b62e0665