Chinese-owned social network TikTok has apologized to a US teenager who was blocked from the service after she posted a viral clip criticizing China's treatment of the Uighur Muslims.

Axar.az reports citing BBC that the firm said it had now lifted the ban, maintaining it was due to 17-year-old Feroza Aziz's prior conduct on the app - and unrelated to Chinese politics.

Additionally, the firm said "human moderation error" was to blame for the video being taken down on Thursday for almost an hour.

TIkTok, owned by Beijing-based ByteDance, has insisted it does not apply Chinese moderation principles to its product outside of mainland China.

Ms Aziz posted on Twitter that she did not accept the firm's explanation.

"Do I believe they took it away because of a unrelated satirical video that was deleted on a previous deleted account of mine? Right after I finished posting a three-part video about the Uighurs? No.”