When copying the link to another browser (internet explorer), I got this error message *“Oops, this form doesn’t exist (anymore). Most likely the owner of the form has deleted it, archived it, or disabled it. Please contact the form’s owner to confirm. Detailed error: Form with ID aQnxeCxtRjrfHFh8nx5W8z not found in /formList”
Note: when using chrome browser, it works with out any problems.
You are seeing this message as shown in the image below as your survey form has been Archived.
To continue your survey (with the same link) please check the Unarchive button as shown in the image below.
Looking at the link you provided I see your ACCOUNT SETTINGS has been checked with Require authentication to see forms and submit data. This is the place from where you log-out. Un-check the same and you should not see the login error message.