To get a ‘Certificat de Coutume’ for marriage in Luxembourg, the required document can be requested from the Thai Embassy in the country where one resides, such as Belgium. It's essential for the Thai applicant to ask for this document, and it should be requested in English or Thai, depending on the language preference of the embassy. In Thailand, there is no age-related documentation needed since a 20-year-old is legally considered an adult.
Before that even happens, my municipality in Luxembourg wants to see this document from my photo, which explains the rules in Thailand regarding marriage. Otherwise, they won't be able to issue me a document confirming that I can get married and that I can then bring with me to Thailand.
as you are from Luxemburg you need to use the thai embassy in Brussels as this one is responsible for people from Luxemburg as well so you need to get the document from them.
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