Please help us help you and fill where relevant:
Your LimeSurvey version: 3.27.31+220104
Own server or LimeSurvey hosting: University hosted
Survey theme/template: University theme
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I sent out my survey for a test run.  One person instantly could not read it, with the CSRF problem after pressing "continue" on the welcome page.

I got the same message when I ran it in Firefox on my desktop (while not logged in to LimeSurvey).  My husband can run it successfully in his Firefox browser and on his Samsung mobile.  I could run it on my desktop in Internet Explorer. 

This seems ODD, I would have thought it works or not.  Is it a cookie problem?  I reject 3rd party cookies but otherwise wouldn't have expected a problem.

I did find another post on the topic but I don't have the same sort of survey.  Mine is simple, mostly with arrays. I have one link at the end to another survey.  That doesn't work either, but I am assuming that is a teething problem on first try.

Some insights greatly appreciated!

Thank you.

Cookie protection on browser.

But it's not a third party cookie.

Can you give us a link of the survey ? Maybe University technical must fix something here.