Support for AWS IoT Core Configurable Domains - which don't contain region in url

[crestidYara]

Which AWS Services is the feature request for?

AWS IoT Core - Configurable Domains

Is your feature request related to a problem? Please describe.
The Android SDK requires that the AWS IoT Core endpoint contains the AWS region in its domain (eg. xxxx.eu-west-1.amazonaws.com). With Configurable Domains, customers can set a domain of their choice for the IoT Core endpoints (eg. iot.customername.com) which will not contain the region in the majority of times.
If a customer sets a custom domain for IoT Core today, the SDK will not be able to open a connection using that domain.

Describe the solution you'd like
The SDK should support custom domain names for AWS IoT Core that dont' necessarily contain the region.

Describe alternatives you've considered
Only viable solution found today is to resolve the amazonaws.com domain through DNS resolution in the device software, and use that to call the SDK methods.

Additional context
None