[Python] Encountered keyerror when run LangChain program with Azure API

I encountered error when I run below codes (extracted from https://python.langchain.com/docs/tutorials/llm_chain/#using-language-models) in Jupyter Notebook:

import getpass
import os

os.environ\["AZURE_OPENAI_API_KEY"\] = "d957dadfasdfafdsfsafasfasfsafasf99f4b7"

from langchain_openai import AzureChatOpenAI

model = AzureChatOpenAI(
azure_endpoint=os.environ\["https://testing123.cognitiveservices.azure.com/"\],
azure_deployment=os.environ\["testing123"\],
openai_api_version=os.environ\["2021-04-30"\],
)


Error I got after run:

KeyError Traceback (most recent call last)
Cell In\[16\], line 10
5 os.environ\["AZURE_OPENAI_API_KEY"\] = "d957dadfasdfafdsfsafasfasfsafasf99f4b7"
7 from langchain_openai import AzureChatOpenAI
9 model = AzureChatOpenAI(
\---\> 10 azure_endpoint=os.environ\["https://testing123.cognitiveservices.azure.com/"\],
11 azure_deployment=os.environ\["testing123"\],
12 openai_api_version=os.environ\["2021-04-30"\],
13 )

File \<frozen os\>:714, in __getitem__(self, key)

KeyError: 'https://testing123.cognitiveservices.azure.com/'


I have checked my Azure portal and end-point is exactly what I copied from. Don't understand why key error existed.

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