Douyin (The Chinese version of TikTok) is under investigation for alleged illegal activity in Taiwan.
The investigation is looking into whether ByteDance, the developer of Douyin, was operating a subsidiary in contravention of a law that restricts Chinese firms from operating in Taiwan.
TikTok is popular in Taiwan, with an estimated 5 million users out of its global user base of over 1 billion.
Authorities launched a probe into TikTok's local commercial interests in Taiwan on December 9.
A suspected ByteDance office was reportedly recruiting Taiwanese social media influencers to boost their influence abroad.
TikTok denies operating any legal entities in Taiwan.
Flouting the enterprise law in Taiwan carries a three-year prison term and a fine of $488,000.
Taiwan is wary of allowing Chinese companies to establish a foothold in the country.
China is suspected of using TikTok and other platforms "to carry out cognitive operations and infiltration other countries."
TikTok denies user data is accessible from China.
Taiwan is considering a private-sector ban on TikTok and other Chinese social media apps, similar to India's ban in 2020.