An agency may not: grant the right to practice law to an individual who is not authorized to practice law; interfere with the right of a lawyer to practice before an agency or the Office; or prohibit any party from being advised or represented at the party’s own expense by an attorney or, if permitted by law, other representative. Subsection (a) of this section may not be interpreted to require the State to furnish publicly provided legal services in any proceeding under this subtitle.