Issue
When opening a Nintex Form using Incognito mode in Chromium based browser (Chrome browser or Chromium based Edge),this following error may occurs in Developer tools:
Uncaught SecurityError: Failed to read the 'localStorage' property from 'Window': Access is denied for this document.
Resolution
This exception is thrown when the "Block third-party cookies and site data" checkbox is set in Content Settings.

This needs to be disabled or an Exceptions needs to be added to the Sharepoint site.
To find the setting, open Chrome settings, type "third" in the search box, click the Content Settings button, and view the fourth item under Cookies.
To find the setting, open Chrome settings, type "third" in the search box, click the Content Settings button, and view the fourth item under Cookies.
Related Links
Please see the original site for further details:
https://www.chromium.org/for-testers/bug-reporting-guidelines/uncaught-securityerror-failed-to-read-the-localstorage-property-from-window-access-is-denied-for-this-document