When a quiz that has Respondus LockDown Browser enabled is copied from one Moodle course shell to another, the Respondus settings do not carry over automatically. As a result, instructors and students may see the following error message:

You can fix this issue by following the steps below:
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Go to your Moodle course where the quiz was copied.
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In the main course page, click on Respondus LockDown Browser Dashboard.
(You’ll find this in the left-side menu)

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Look for the affected quiz in the list. It will likely show an error.

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Click the dropdown arrow beside the quiz name.

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Select "Settings" for the quiz.
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Change the setting from "Require LockDown Browser" to "Don't require", then Save + Close.
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Re-open the settings and re-enable LockDown Browser, then Save + Close again. Note: do this step only if you want Respondus enabled.