When the form is displayed via a URL with the _uuid parameter, the value of the origin parameter is forced to Adobe Campaign.
_uuid enables form viewing before publication and error tracking. This parameter is for internal use (creation and debug): when you access the Web form via this URL, the records created aren't taken into account in the tracking (reports). The origin is forced to the Adobe Campaign value.
It is used with the _preview parameters and/or _debug:
_preview to display the last saved version. This parameter must be used in the test phase only.
_debug to display the trace of the data input or calculated in the pages of the form. This is used to obtain more information about errors, including once the form has been published.