Upvote:4
Since your Japanese visa is expired by less than 10 years, you can use it and the TAC to visit Taiwan
Per TIMATIC, the database used by airlines (if check-in staff tries to deny you boarding, point to this):
Visa required, except for Nationals of India with a printed Travel Authorization Certificate for a maximum stay of 14 days. The Travel Authorization Certificate is obtained at https://oa1.immigration.gov.tw/nia_southeast/. They must also have a valid resident or visitor visa (incl. electronic) issued by Australia, Canada, Ireland (Rep.), Japan, Korea (Rep.), New Zealand, USA, United Kingdom or a Schengen Member State. A resident card or visa that has expired less than 10 years prior to the date of arrival can still be used for entry. Passengers with a work permit are not eligible.