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Authentication error on SmartForms: "The request was not authenticated. Click here to reauthenticate."

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This article was created in response to a support issue logged with K2. The content may include typographical errors and may be revised at any time without notice. This article is not considered official documentation for K2 software and is provided "as is" with no warranties.
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Issue

You may encounter the following error on SmartForms:

"The request was not authenticated. Click here to reauthenticate."

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Symptoms

The issue does not occur for all users, and the error goes away after reloading the page.

Troubleshooting Steps

You may extend the Session Token and the Maximum Token Lifetime values as per the KB article here.