Trading with Huawei was seen as the U.S. olive branch offered to China to ease trade tensions.
But according to an email seen by Reuters, a senior U.S. official told the Commerce Department's enforcement staff this week that China's Huawei should still be treated as blacklisted.
On Saturday, President Donald Trump promised to allow U.S. companies to sell products again to Huawei Technologies.
Washington alleged the Chinese firm could use its technology to spy on customers- which Huawei denies.
And also accused it of stealing American intellectual property and violating Iran sanctions.
In May, Huawei was added to a so-called Entity List- which bans American firms from selling to it without special permission.
But according to an email seen by Reuters- the company was still said to be on the Entity List.
Trump's trade truce with China was hailed by U.S. chip makers.
But the industry and government officials are still struggling to understand what Huawei policy Trump had unveiled.
It's unclear when the Commerce Department will provide its enforcement staff with additional guidance, following Trump's comments.
A Huawei spokesman told Reuters on Wednesday that it was willing to continue buying U.S. products But that they did not see quote "much impact" on what it is currently doing.