The Taiwan Semiconductor Manufacturing Company (TSMC) supplies the silicon on which many OEMs' SoCs or devices are based, Huawei's included. However, the current US administration has issued an executive order that prevents the latter from conducting this kind of business. TSMC has stated that it is complying with the directive.
https://www.notebookcheck.net/TSMC-confirms-that-it-is-taking-no-new-orders-from-Huawei.481723.0.html