Microsoft Bing Map Key I created at 2016 and 2020 works well until this year some day becomes invalid. 

All user try to load following page, will get error message cross bing maps in the middle: 

 

The specified credentials are invalid. You can sign up for a free developer account at http://www.bingmapsportal.com

 

I am not sure why. I tried remove web service security rule I created at 2016 and 2020, which limit the web service only works within domain https://transparentgov.net and http://localhost.  However, still not working.  The key I created at 2021 works. No way to fix the old 2016 keys and 2020 keys.  Currently what you see is using 2021 keys. 

See this example using microsoft bing maps

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