You are not alone. I also encountered this problem recently, and someone else also posted expressing the same problem.
https://forums.flightsimulator.com/t/bing-map-not-load-recently-msfs2020/
@ AvianCypress131 悲催的是我近期也遇上了同样的问题。
我尝试过裸连、加速器、VPN（全局）、Proxifier强制代理均宣告无效，怀疑是微软那端出了问题。
难兄难弟了属于是 