This is the process I followed and they call it « in-country ED-visa application process » so I understood that it is indeed the initial visa and not an extension hence my confusion. I will talk to the school and to immigration as you recommended to clarify what is the best course of action
actually I am on the original ED visa and not on extension it stay (I entered on tourist TR visa and changed it to ED while in Bangkok) and never did any extension of stay
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