If you are a citizen of more than one country (excluding Thailand), you are still eligible to apply for the Thailand Privilege Visa. You must choose one passport to use for your application, and this will be the passport you use to enter and exit Thailand.
Important details to keep in mind:
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Restricted nationalities: If one of your nationalities is on the restricted countries list but your other nationality is not, you must apply using the passport from the nationality not on the list.
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Non-visa exempt nationalities: If you apply with a passport from a country that is not visa exempt, you will need to submit your Thailand Privilege Visa application outside Thailand and have the visa affixed at a Thai Embassy or Royal Thai Consulate in that country.
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Passport validity: The passport you use for your application must be valid for at least 12 months (365 days) at the time of submission.