No person shall be eligible to attend before any authority as a goods and services tax practitioner in connection with any proceedings under the Act on behalf of any registered or un-registered person unless he has been enrolled under rule 83.

A goods and services tax practitioner attending on behalf of a registered or an unregistered person in any proceedings under the Act before any authority shall produce before such authority, if required, a copy of the authorisation given by such person in FORM GST PCT-05.