Is there any news regarding the upcoming Chrome 80 update that will institute a secure-by-default model for cookies?
This relates to the warnings seen in the console when a form loads that look like:
A cookie associated with a cross-site resource at http://tenant.sharepoint.com/ was set without the 'SameSite' attribute. A future release of Chrome will only deliver cookies with cross-site requests if they are set with 'SameSite=None' and 'Secure'. You can review cookies in developer tools under Application>Storage>Cookies and see more details at https://www.chromestatus.com/feature/5088147346030592 and https://www.chromestatus.com/feature/5633521622188032.
The Jan 30th and Feb 3rd releases have improved cookie support for Chrome 80 in New Responsive and Classic forms.
Here's a link to the release notes: Nintex Forms for Office 365 - Release Notes