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When you try to access the Blackboard – “Lecture Videos Panopto” tab via any browser and receive an error, you encounter this error due to the popup settings of your browser. You can benefit from the solution on the relevant page. Whichever browser you are using, activating the popup setting of that browser will solve the problem.
https://support.panopto.com/s/article/How-to-Enable-Third-Party-Cookies-in-Supported-Browsers