I opened one in October 2021 with Bangkok Bank, head office. I needed to submit an Embassy Certified copy of my passport, TM30 info and had my Thai partner come along, she was asked to vouch for my address.
Declined to take their insurance, deposited 500THB. Took about 45 minutes. I was on a covid extended Tourist Visa.
initially, I was asking for the wrong document from the UK Embassy. I was asking for a letter confirming residence, which they cannot give to me while on a tourist visa. Then the bank said they would accept a certified copy of my passport. Obviously every countries embassy is different, but I started off asking for the wrong thing and not realising
I think what they probably want from your embassy is an 'Embassy certified copy of your passport' at least that's what Bangkok Bank wanted from me. (Although that was in Bangkok, last October). No insurance was needed, it was offered but I didn't want it.
Covid extended tourist visa planning for non-o retirement