I saw a rejection that said foreign accounts are fine but they wanted certain documentation. Chiang Mai seem to be more particular in the case of extensions, not DTV, than other offices such as Jomtien. An agent told me they wanted a bank in Chiang Mai. I could use my Bangkok or Pattaya accounts but the documentation would have to come from the holding branch directly and not from a branch in CM.
I can see neighbouring countries getting more difficult. Immigration seem to have their tails in the air about it. There is politics at play. Anutin has been leading raids on short term rentals. Some of the properties raided are interesting but that is all I am posting here
The Embassy has made a decision that the METV is more appropriate. Seen it for medical and some other soft power. Seems to be becoming more common in last moth or so.
We have seen this same thing from a few Embassies ie giving a METV instead of DTV if in their discretion it is more appropriate. It is not a mistake it is deliberate.