@Jiahao Thanks for the question. Please follow the below document to find and list the published service and the sample notebook to explore the web service.
https://learn.microsoft.com/en-us/machine-learning-server/operationalize/python/how-to-consume-web-services#find-and-list-web-services
https://github.com/Microsoft/ML-Server-Python-Samples/blob/master/operationalize/Explore_Consume_Python_Web_Services.ipynb
known issues in machine learning server:
https://learn.microsoft.com/en-us/machine-learning-server/resources-known-issues