thank you for your answer.
We heard that before COVID, we can do that in any Thai embassy in any countries, so we think it will be the same , can do that in any province.
It means he need to stay in Chiang Mai until he got the non b visa ??
How many days have to wait ? ( so much money in hotel ....... ) and is it only 2000 bahts? He is wondering if the immigration stuff request any extra money .......?