The email, which was seen by several news organisations and quoted on social media, reportedly told employees: "Due to security risk, the TikTok app is no longer permitted on mobile devices that access Amazon email". "Due to concerns about TikTok's privacy and security controls and practices, and because corporate-owned devices should be used for company business only, we have directed those employees to remove the app from their devices".
ByteDance acquired Musical.ly - the American company that has since merged with TikTok - in 2017, and last November, the USA government opened a national security review of that deal.
"We're proud that hundreds of millions of people turn to TikTok for entertainment, inspiration, and connection, including numerous Amazon employees and contractors who have been on the frontlines of this pandemic", the spokesperson said.
Short-video app TikTok has halted operations in Hong Kong, according to a notice posted on its website.
He also reiterated previous pledges that ByteDance would refuse to share TikTok user data with Chinese authorities.
ByteDance and TikTok have said that all their U.S. user data is stored in-country and that the American operation does not fall under Chinese jurisdiction. TikTok has repeatedly denied allegations that it poses a threat to USA national security.
Amazon's moves came days after U.S. Secretary of State Mike Pompeo's comment Monday that the Trump administration is looking at banning Chinese social media apps, including TikTok. The parent company of TikTok, ByteDance, has said that user data is stored in the United States, with a backup in Singapore.
None of the Chinese companies has yet mounted a legal challenge, with industry sources saying they were waiting for further clarity from the government.
As for sharing U.S. user data with the Chinese government, the company says it stores USA user data in the US and Singapore, not China; that its data centres are outside of China; and it would not give the government access to U.S. user data even if asked.
Earlier this month, India announced it will ban TikTok and other popular Chinese apps citing threats to " sovereignty and integrity".