How to Fix Cannot Change Microsoft Forms Quiz Start or End Dates
Question details
The user is unable to modify the start or end dates of a Microsoft Forms quiz because it is linked to a Microsoft Teams assignment.

- Product
- Microsoft Forms and Teams
- Device & OS
- not provided
- Scenario
- Attempting to update the availability dates of a Microsoft Forms quiz that has been assigned to students via Microsoft Teams.
- Observed behavior
- The date fields in Microsoft Forms are grayed out, unavailable, or show outdated values because the dates are exclusively controlled by the connected Teams assignment.
Ensure you have the necessary teacher or admin permissions within the Microsoft Teams class to edit existing assignments and update their availability timelines.
Update Quiz Dates Through Microsoft Teams Assignments
Since the Teams assignment controls the quiz availability, you must edit the assignment details in Microsoft Teams instead of Microsoft Forms.
When a Microsoft Forms quiz is attached to a Teams assignment, the assignment settings override the native Forms date settings. This ensures that the quiz timeline stays perfectly synchronized with the assignment timeline visible to students.
Launch Microsoft Teams and navigate to the specific class team where the quiz was assigned.
Select the 'Assignments' tab located on the left sidebar or the top navigation menu.
Find and open the assignment that contains the locked Microsoft Forms quiz.
Click the three-dot menu (More options) in the upper right corner and select 'Edit assignment'.
Adjust the start date, due date, and close date as needed, then click the 'Update' button to apply the changes.

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Frequently Asked Questions
Why are the start and end dates grayed out in Microsoft Forms?
When a form or quiz is used as a Microsoft Teams assignment, Teams takes over the date controls to ensure students see the correct availability. You must edit the dates within the Teams application.
Can I decouple a Microsoft Form from a Teams assignment to edit it directly?
Once linked to an assignment, the dates are strictly managed by Teams. To edit dates directly in Forms without Teams interference, you would need to duplicate the quiz in Microsoft Forms and share it independently.
Will updating the Teams assignment date automatically update the linked Form?
Yes, once you click 'Update' on the Teams assignment, the availability rules are enforced for all students accessing the attached Microsoft Forms quiz.




