It is currently unsupported to attach an AWS DX VIF that is in a different region than the VCDR Protected Site. It is recommended to create the AWS DX VIF and VCDR Protected Site in the same region in order to attach successfully.
This issue will be resolved in a future VCDR release.
Workaround:
If there is a requirement to attach an AWS DX VIF that is in a different region than the VCDR Protected Site, please engage
VMware Global Support with the ask to attach it. Please provide the Org ID associated to the environment and the AWS DX VIF name.