A person or a firm not a resident of the Territory applying for a certificate under section 250c of this chapter or a permit to practice under section 250d shall appoint a resident agent as permitted by law or Board regulations. The applicant’s agent must be a person upon whom process may be served in any action or proceeding against the applicant arising out of any transaction or operation connected with or incidental to services performed by the applicant while a permittee within the Territory.