that's actually not sports authority license that's the board of boxing sport. It's a sub department of the sports authority. It should serve the same purpose and will be accepted but it's different to the sports authority of Thailand gym license
I have done 50 muay thai visas from my gym in chiang mai. We are not a registered school with the ministry of education. But the schools that are registered are trying to tell people it's a requirement in order to monopolize and compensate for loss of ed visa buisness, but that's not true.
You definitely need sports authority of Thailand gym license. Board of Boxing Sport A License is often requested and ministry of education skills development certification is a bonus. The gym should also be a Ltd company.
Your average gym will have sports authority license and maybe A License but only the big gyms are Ltd company
We have the lot and never failed on soft power paperwork although 1 guy failed on bank statements