Affidavit for legalizing a TEFL certificate in Hanoi


My employer asked me to legalize my TEFL certificate, so that I can qualify for a work permit.

I should go to the Canadian (The TEFL is from Canada) embassy first to have it notarized.  I heard that if  the embassy cannot notarize it for any reasons, I can write an affidavit instead. Is it true?

Thanks in advance for any answers.

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