@悠暉 山本 Welcome to Microsoft Q&A Forum, Thank you for posting your query here!
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I tried executing the same sample mentioned here:
https://github.com/microsoft/bing-search-sdk-for-python/blob/main/samples/rest/BingWebSearchV7.py
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It worked fine and I got a successful response from the Bing Search API endpoint.
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Please ensure that you have entered your key and endpoint details correctly as shown below and check if that helps.
# Add your Bing Search V7 subscription key and endpoint to your environment variables.
subscription_key = "aae3XXXXXXXXXXfe1c31"
endpoint = "https://api.bing.microsoft.com" + "/v7.0/search"
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If you have any follow-up questions, please let me know. I would be happy to help.