Previously, Amazon went bust with an "error 503 services not available" issue, costing the company about $34 million in revenue in an hour. Even Jeff Bezos spoke out about the matter on social media. But later they solved the problem. Likewise, the Amazon iOS app has not been working for the past two days due to Amazon CS11 errors on iOS 15 and older versions. In this post, we have provided the complete solution to solve this problem easily, so read and apply the given solution to solve this problem, but if you are unable to do this, you can try to contact an Amazon expert via Amazon Calling .