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It's not that TVIs can't teach O&M, it's that TVI's must be dual-certified (as a TVI and a COMS) to also teach O&M. While I can't find an exact quote to explain it, I found the following from several different places:

"Orientation and mobility was included the first time as a related service, with the passage of IDEA 1997. Originally developed by the Veteran’s Administration to assist war-blinded veterans, the profession of Orientation and Mobility (O&M) has expanded to include training from early childhood through adulthood. This service is provided by individuals who are formally educated to assist persons who are blind/visually impaired attain their O&M goals."? (from? )

From website:

A Certified Orientation & Mobility Specialist (COMS), is a highly trained expert who specializes in working with individuals who are blind, low vision or who have functional visual limitations, and empowers them to achieve their life goals for education, employment, avocation and independence. A COMS may be blind, partially sighted or sighted. COMS are engaged in a comprehensive approach to orientation & mobility addressing nonvisual, visual, physical, cognitive, and psycho-social aspects related to mobility training for individuals of all ages, as well as diverse needs and abilities.

They are educated in a range of instructional techniques and how to recognize which approach is best suited to a particular learner. These techniques include, but are not limited to, inquiry-based learning, expeditionary learning, differentiated instruction, and direct instruction. COMS recognize that there is no single instructional strategy that would be best for everyone. COMS teach skills to meet the current and future orientation and mobility needs of their clients, accounting for each client’s goals, travel environments, and visual prognoses. They use a guided exploration and problem-solving approach that is customized to the goals and skills of each learner. Methods and strategies include the use of non-visual techniques (auditory and tactual) and visual techniques including the optimization of reliable remaining vision . Strategies and problem-solving skills are taught with the goal to develop independent travelers with a high level of self-confidence.

The COMS has completed an extensive educational program and successfully completed a 350+ hour internship under the supervision of an experienced COMS. Furthermore, the COMS has met a rigorous standard by meeting the educational requirements, supervised fieldwork experiences in their internship and passing the certification exam. The exam was developed in collaboration with PhD level psychometricians following scientific, best practices standards for certification exams.

A COMS will recertify every five years to ensure that they maintain current knowledge.

COMS Certification Handbook