Update: I have tried again to open a thread but the error still occures.
403 ERROR
The request could not be satisfied.
Request blocked. We can't connect to the server for this app or website at this time. There might be too much traffic or a configuration error. Try again later, or contact the app or website owner.
If you provide content to customers through CloudFront, you can find steps to troubleshoot and help prevent this error by reviewing the CloudFront documentation.
Generated by cloudfront (CloudFront)
Request ID: dCKJmxKBUar0mhd2SALhNDLJ8fKJvxBZ6944SOakBc1Y5WBU-ACg0w==
I will try one more thing. Not giving up yet.
small extra update: somehow the reply works fine.