Do recipients of forms sent via Acrobat.com need to have Adobe account

I have been troubleshooting sending a returnable RSVP form for the last several days. I finally was able to "close the loop" with a form sent via Acrobat.com to myself. I could link to it from the email, download it, complete it and submit it back to myself where it showed up in Tracker. All good so far.

I tried the same thing with a small group of colleagues and have received three responses from recipients who do not have Adobe.com accounts: after downloading and completing the form, they submit and enter their email addresses. They are then directed to a page asking for their Adobe.com login and password and must register for an account if they don't have one.

One of the three gave up. Another established an account but was not then given access to the form to submit it. The third set up an account, received an email to verify his email address and clicked the link to return to Acrobat.com for email verification. The app hung on "Verifying email". When he clicked the submit button, he was notified that the form had been submitted. His email was never verified and he had to Force Quit Acrobat.com (Mac OSX.) I have no record that his form was ever submitted.

Nowhere in the instructions for this process can I find any requirement for form recipients to have an Adobe account. Is this the case? If so, a lot of recipients without these accounts will not spend the time or effort to sign up (and the signup process seems flawed, too.)

Has anyone else run into this?