I have a question regarding the usage of the DeviceCheck API. We have been using https://api.development.devicecheck.apple.com/v1/validate_device_token for checking device tokens.
However, we encountered frequent HTTP response status code 403 between 16:50 and 17:15 Japan time on June 29th. According to the official documentation at https://developer.apple.com/documentation/devicecheck/accessing_and_modifying_per-device_data, I understand that a 403 error indicates "The specified action isn't allowed". Yet, I would like to clarify under what specific circumstances this error would be returned.
Please note that we do not encounter a 403 error outside the aforementioned timeframe, which leads us to believe there is no issue with our basic implementation.