Except as provided in this section, if an authority has 2 or more members, any of the member political subdivisions may withdraw from the authority. Any political subdivision may join the authority. After an authority that has 2 or more member political subdivisions incurs an obligation, the member political subdivisions may not withdraw from the authority. By law, the governing body of a political subdivision shall show its intention to withdraw from or join an existing authority. If, by resolution, the board of directors of an authority consents to the withdrawal of a political subdivision from the authority, the following persons shall sign and acknowledge articles of withdrawal: The authorized officers of the withdrawing political subdivision; and The authorized officers of the authority. If, by resolution, the board of directors of an authority consents to the addition of a political subdivision as a member of the authority, the following persons shall sign and acknowledge articles of joinder: The authorized officers of the joining political subdivision; The authorized officers of the authority; and After they are authorized by law of the governing bodies of their respective political subdivisions, the authorized officers of the political subdivisions that are then members of the authority. Articles of joinder under this section shall include, for the joining political subdivision, all of the information required under § 9-907(b) of this subtitle, including the name, address, and term of office of the 1st member of the board of directors of the authority from the joining political subdivision. The officers of the authority shall file articles of withdrawal or articles of joinder under this section for record with the State Department of Assessments and Taxation. The State Department of Assessments and Taxation shall: Receive the articles of withdrawal or articles of joinder; Mark the date and time of receipt to the articles; and Issue a certificate of approval for any articles that comply with this subtitle. When the State Department of Assessments and Taxation issues a certificate of approval, the articles of withdrawal or articles of joinder: Are in full force and effect; and Are conclusively considered to be lawfully and properly adopted.