Amazon AWS - ECS pattern fails at step. 3.1. List ECS Clusters.
1. Please check with your AWS admin if the AWS Credentials has proper access.
2. The account needs access to execute the DescribeRegions API call.
3. Do provide necessary privileges to the credential to execute the pattern without forbidden issues.
If the above are correct and validated then please work with your internal Network team to see if there is a firewall that blocks the connection on the Mid server.