Did you get it at The Thailand Trade and Economic office in Taipei? And are you a legal resident in Taiwan or tourist that went there just for the DTV visa?
A friend living in Taipei called the office twice today to confirm. They told her "as long as the documents are complete, they will issue DTV, regardless of the applicant's nationality or country of residence."
Do you have to be a resident in Taiwan? (Your post implied no need to, but I just want to make sure.) Can I visit Taiwan as a tourist and apply the DTV visa there?