Red Hat Satellite 6.4にホスト（VM）を追加するとエラーが発生する

bootstrapコマンドを実行しようとすると、次のエラーが発生します。

RUNNING], [2019-05-13 13:58:15], [Calling Foreman API to create domain mytestdomain.com associated with the org & location]
An error occured: HTTP Error 422: Unprocessable Entity
url: https://redhat-satellite-64.mytestdomain.com:443/api/v2/domains
code: 422
data: {
"domain": {
"location_ids": [
2
],
"name": "mytestdomain.com",
"organization_ids": [
1
]
}
}
error: {
"error": {
"errors": {
"name": [
"has already been taken"
]
},
"id": null,
"full_messages": [
"Name has already been taken"
]
}
}

誰でもアドバイスできますか？