Allow authenticated but anonymous responses with one response …
https://techcommunity.microsoft.com/t5/microsoft-forms-blog/allow-authenticated-but-anonymous-responses-with-one-response/ba-p/200379
WebJun 3, 2018 · This allows you to create an anonymous internal survey, limiting a single response for each person. How does the feature work? When people in your organization or school sign in and submit their responses, Forms will only log a hash key based on their Office 365 accounts, but not record their names or email addresses.
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