Synchrony could not start on some AWS regions (e.g. Ohio)

When attempting to deploy Confluence to some AWS regions Synchrony will not start properly because of AWS API using the wrong endpoint. The effected regions are:

• US East (Ohio) - us-east-2
• EU (London) - eu-west-2 - See Note 1
• Asia Pacific (Mumbai) - ap-south-1 - See Note 1
• Asia Pacific (Seoul) - ap-northeast-2 - See Note 1
• Canada (Central) - ca-central-1 - See Note 1

Note 1: presently does not support EFS which is required to deploy on AWS using the Atlassian CloudFormation template

Workaround

a. Use a different region to deploy Confluence

or

b. Do not deploy Synchrony and disable Collaborative Editing in Confluence