Dad is dual ROC / US citizen (though his passport is expired).
Mom is US citizen (renounced PRC).
They were married in PRC and have a PRC marriage certificate. I tried contacting TECO SF regarding how to authenticate their marriage certificate for my passport application, and was told I need to get it authenticated by both 海協會 ( CHINA) and 海基會 (TAIWAN).
I’m not sure how to proceed. These entities are in PRC and ROC respectively. Why wouldn’t the PRC Consulate and TECO SF be able to authenticate a PRC marriage certificate?