As per Taiwan authority’s new control requirements on inbound roaming, 

all data card users must complete real-name registration before continuing to use data service in Taiwan, starting from 10 November 2023 10 am (GMT+8). Users can go to our website by scanning below QR code and complete the real-name registration by uploading identification documents.

https://www.icard.com.sg/pages/hk-real-name-registration-faq

150 Days from purchase date