Trust Protection Platform version 22.2 and below. (South Africa Region was added in 22.3)
When creating a new AWS application, South Africa (Cape Town) Region is not available as an option.
This is a newer region that was added in version 22.3 so is not present in previous versions.
Upgrade to version 22.3 or contact support for an 'Edit Authorization' and navigate to the Support>Policy Attributes tab of the Policy where the app is contained and add in the following values.
Attribute: Load Balancer Region Code
Class: Amazon App
Anything under this policy will be sent to the South Africa Region.