Application for Tribal Certificate of Exemption. The Tribe may apply for a Tribal Certificate of Exemption by filing a written request with the Department stating the name and business address of the Tribe, and the names and titles of the Tribal officials that are authorized by the Tribe to sign Tribal Certificate of Exemption on behalf of the Tribe. Upon receipt of the Tribe’s request signifying its election to use the Tribal Certificate of Exemption, the Department shall issue to the Tribe a Letter of Authorization indicating that it may begin using the Tribal Certificate of Exemption as provided in this § XII.