Hello,
Thanks for reporting your issue. This error seems to be due to the recent migration of the service from cognitive services to Microsoft Bing, our team is aware of the same and are working to update the SDKs accordingly. You can use the existing keys directly with the REST API to get the correct response. We understand that this could be a frustrating experience until the SDKs are updated, we will update this issue with more details as soon as we have a fix.
https://learn.microsoft.com/en-us/azure/cognitive-services/bing-web-search/quickstarts/python
Please changed the search_url to https://api.bing.microsoft.com/v7.0/search in above document.
Regards,
Yutong