webservice URL location part is not consistent in ACIWebservice

Hi,

Last week I noticed that the URL of a deployed aciwebservice is not the same as before, ie., location part was not the same as before. It was always `http://xxx-classification.northeurope.azurecontainer.io/score`, but now it is `http://xxx-classification.westus.azurecontainer.io/score`. Based on documentation, [The Azure region to deploy this Webservice to. If not specified the Workspace location will be used.](https://docs.microsoft.com/en-us/python/api/azureml-core/azureml.core.webservice.aci.aciwebservice?view=azure-ml-py#deploy-configuration-cpu-cores-none--memory-gb-none--tags-none--properties-none--description-none--location-none--auth-enabled-none--ssl-enabled-none--enable-app-insights-none--ssl-cert-pem-file-none--ssl-key-pem-file-none--ssl-cname-none--dns-name-label-none--primary-key-none--secondary-key-none--collect-model-data-none--cmk-vault-base-url-none--cmk-key-name-none--cmk-key-version-none--vnet-name-none--subnet-name-none-) . My workspace is `northeurope` and `location` field was not set.

Why is my aciwebservice deployed in `westus` ?

We have CICD pipelines running for our repo. Sometimes we manually trigger the jobs. The pipeline did not break but our applications failed because of URL change.

報告提到了 ACIWebservice 部署設定以及被省略的 location 欄位，但沒有指出任何儲存庫檔案或測試。首先追蹤 location 未設定時 SDK 如何選擇 ACI 區域，並使用位於 northeurope 的 workspace 重現部署。當所選區域遵循文件所述的預設值，且 URL 行為穩定並有文件記錄時，即視為完成。

由索引模型根據 Issue 內容生成。