Does the gym's certification matter when applying for a DTV Muay Thai visa in Thailand?

When applying for a DTV Muay Thai visa in Thailand, the gym's certification may be important, but it doesn't seem to be a strict requirement. Various comments indicate that as long as the gym provides the proper documentation and is legitimate, it should be sufficient for visa processing. Some users note that certain gyms, like Dowden Muay Thai and Muay Thai Fever, have successfully processed DTV visas, while others believe that only certified gyms will be accepted. There seems to be some confusion regarding the necessity of certification, as some commenters assert that it is needed, while others believe it is not officially required.