Amazon is working to fix a flaw that cost some AWS customers billions of dollars

Some Amazon cloud customers woke up Friday to a surprise bill estimate that they owed billions of dollars for cloud services they never used.

Amazon confirmed on Friday that it is trying to resolve a flaw in its Amazon Web Services (AWS) billing portal that showed some customers “owing” millions or billions of dollars in cloud computing costs.

in Update on its status pageAmazon said it began seeing inaccurate billing data as of late Thursday. But by Friday morning, the company admitted that “rolling back the recent change did not resolve the issue.” Amazon said the change relates to the billing subsystem.

The good news for customers who have been told they “owe” millions or billions to Amazon is likely to be on the hook. Amazon said billing estimates “do not reflect actual usage and fees.”

According to several screenshots Posted by Amazon customers on Redditone customer was quoted estimating billings at nearly $2.5 billion for this month’s AWS usage, while others received similar alerts, ranging from a few million dollars to hundreds of millions of dollars.

An Amazon spokesperson did not immediately respond to a request for comment. The issue is expected to continue for several more hours, according to Amazon’s status page.