Caught an AmazonServiceException, which means your request made it to Amazon SNS, but was rejected with an error response for some reason.
Error Message: The security token included in the request is invalid. (Service: AmazonSNS; Status Code: 403; Error Code: InvalidClientTokenId; Request ID: cf4cbbd5-82e3-5945-9be7-ea3366882153)
HTTP Status Code: 403
AWS Error Code: InvalidClientTokenId
Error Type: Client
Request ID: cf4cbbd5-82e3-5945-9be7-ea3366882153
I used online base64 to hex conversions to convert my device token (that I am pretty sure is in base64) to a hex which is needed and I am still getting the same error and I am not sure what else the issue could be.
If the problem is with the Amazon site, you may need to ask the site about your problems.