Hi there,
I'm Cherrelyn, and I completely understand how disappointing it is. You're not alone and many users have noticed the Traffic widget hasn’t worked since the May update. Microsoft hasn’t made an official announcement, but it seems the feature has been temporarily disabled or is undergoing backend changes. Since it’s still listed but marked unavailable, support may return, but there’s no timeline yet.
For now, you’ve done all the right steps by reinstalling and checking on a clean system.
Warm regards,
Cherrelyn