Finally Figured it out. You'll need to run up an EC2 instance in windows, connected to your domain/Directory Name and admin . Now when you run your instance, click other user and enter your credential as if your were logging into an domain account. domainname\Administrator and then use your Directory Password. This now logs you in with the correct credentials.
It has to be an EC2 instance because the Workspace instances will not allow you to switch users.
It sounds like you are not logged in as a user with domain directory privileges. To create users and groups in an AWS Directory Service directory, you must be logged in as a user that has privileges to create users and groups. Make sure you are logging in to your Workspace as Administrator. You should be able tom perform the steps in a workspace and not have to use an EC2 instance.
When you create a directory with Simple AD, AWS Directory Service performs the following tasks on your behalf: Creates a directory administrator account with the user name Administrator and the specified password. You use this account to manage your directory.
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