Any person entitled to a hearing pursuant to §
1309.42 or
1309.43 who fails to file a timely request for a hearing, shall be deemed to have waived their right to a hearing and to be in default, unless the registrant/applicant establishes good cause for failing to file a timely hearing request. Any person who has failed to timely request a hearing under
paragraph (a) may seek to be excused from the default by filing a motion with the Office of Administrative Law Judges establishing good cause to excuse the default no later than 45 days after the date of receipt of the order to show cause. Thereafter, any person who has failed to timely request a hearing under
paragraph (a) and seeks to be excused from the default, shall file such motion with the Office of the Administrator, which shall have exclusive authority to rule on the motion.