https://www.cnet.com/news/cia-reportedly-says-huawei-funded-by-chinese-state-security/

The core issue with Huawei has been concerns over its coziness with the Chinese government and fears that its equipment could be used to spy on other countries and companies. It's the reason why the US banned companies from using Huawei networking equipment in 2012.

In January, the US Justice Department unsealed indictments that included 23 counts pertaining to the theft of intellectual property, obstruction of justice and fraud related to its alleged evasion of US sanctions against Iran. One 10-count indictment accuses Huawei of stealing trade secrets from US carrier T-Mobile beginning in 2012.