Why not just ask the Embassy.

You wasted time and money to get a tourist visa.

Reconsider if a Thai bankaccount is need-to-have or nice-to-have.

Banks in Thailand are like everywhere in the world, interested in having good stable custormers, that have a permanent address, a steady easy traceable income, and use the account all year round.

That is why the banks are reluctant to give accounts to people on short time ( read: tourist ) visas, and who only spend part of the year in Thailand.

Don’t expect to get a residence certificat, until you have stayed at a permanent adress in at least 3 month, since that is what the residence certificat should confirm.

Furthermore the added attention on whitewashing of money, is an added burden on the banks, so even depositing large amounts isn’t a guaranteed way to open an account.

The value of a resident certificat, had gone down, since Immigration Officers are giving them to people that are not on a longterm visa, or have stayed severel months at 1 adress in Thailand, so even if it is a formal requirement, the bank make up their own assesment of the stability of the want-to-be customer.

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ED is a difficult visa to get, and you have to attend classes

Every try may cost you the 10.000 Baht non-refundable fee, so pick the right Embassy.

Only the Embassy you apply at, can give a precise answer to what they allow.