AWS WorkSpaces - AWS Managed AD w/ Trusted Domain


I’m in a bit of a jam deploying WorkSpaces, as I’m unable to assign users from my on-prem domain that has a 2-way trust with AWS Managed AD. The AWS Managed AD is used for the WorkSpace Directory. I’m able to assign the users from my on-prem domain when using the AWS GUI, but there doesn’t seem to be any available way to do this with Terraform - has anyone been able to assign trusted domain users to a WorkSpace?