@Frameworks Engineer , Hello! I also received a 404 although a receipt's expiration time is not expired. So I was wondering if there is an internal expiration time in Apple.

The keyId successfully passed attestation previously, and assertion was successful with the same keyId until a certain point. However, after that point, the assertion has been failing continuously. Since the clientDataHash is hashed with SHA256 every time, I believe there is no issue with that. What could be the problem?