Article 5 of 戶政事務所辦理結婚登記作業規定 requests marriage abroad for foreign spouses from certain countries.
List of the 22 countries. In Chinese.
特定國家配偶來臺申請依親簽證手續說明
https://www.boca.gov.tw/dl-1763-c5577d44615748648d774fff51ec5a85.html
The countries are, Thailand, Indonesia, Vietnam, Cambodia, Philippines, Myanmar, Senegal, Nigeria, Cameroon, Ghana, Gambia, Pakistan, Mongol, Belarus, Ukraine, Uzbek, Kazakh, India, Nepal, Bhutan, Sri Lanka, and Bangladesh. As of 2018 Dec 10.
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I think some of my old posts may be wrong.