Dear Wei Lin3
Thank you for posting in the Microsoft community.
Regarding your question.
I tested this page and it no longer opens, it should be that this web resource has been temporarily removed, we guess it may be in the process of updating and redeploying to a new version.
The Bing Package Tracking feature is still in operation and maintenance.
You search “bing package tracking” in BING.
The feature is integrated into the search results, and you can still search for your UPS bill number.

https://www.microsoft.com/en-us/edge/learning-center/package-tracking
Referring to this website, you can add the Bing Package Tracking extension application to your browser.
Hope the above information can help you.
Best Wish
Shawn.Z-MSFT | Microsoft Community Support Specialist