Taiwan Semiconductor Manufacturing Co. discovered this month that chips it made for a specific customer ended up with Huawei Technologies Co., a potential violation of US sanctions intended to sever the flow of technology to a Chinese national champion.

Notably, TSMC has maintained that it has not done any business with Huawei since mid-September 2020, when stricter US sanctions were enforced. The company also claimed that it has not manufactured any chips for Huawei since the new restrictions came into effect. On its part, Huawei denied ever launching the 910B chip.

TSMC might be in trouble after its chip was found in a teardown of a Huawei device, which is a possible violation of U.S. export restrictions on Chinese companies.