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Hi @petanovotny234 ,
Hope you are doing well.
As I see you are receiving the “Nonce Validation Failed!” message while trying to submit a quiz/survey then it’s usually due to a cached quiz page. To get rid of this issue, it’s recommended to disable caching of quiz pages/URLs.
Please check this documentation for detailed information – https://quizandsurveymaster.com/nonce-validation-failed/
Hope this helps. Please don’t hesitate to reach out to me if you need any further assistance.
Regards,
Sumit