A web-based tool in Microsoft 365 that enables users to quickly create surveys, quizzes, polls, and feedback forms.
Dear Mariangela,
Thanks for your support of our products.
We understand you want to share a form link that the user can only submit once when it is shared.
We can set the shared link as below:
Now the internal users can only respond to it once after signing in his work account. For your reference: https://support.microsoft.com/en-us/office/adjust-your-form-or-quiz-settings-in-microsoft-forms-f255a4ba-e03c-4e12-b880-f7e8b62e0665
Please let us know if you have any further concerns.
Best Regards,
Ivy