Hi Robby
I am having the same exact problem with WMP 12 on my Windows 7 PC. It started for me on Friday (06/07/19) of last week. I just chatted with a Tech support person on the Microsoft site and they were telling me that the site is working for them and that the problem of course is on my end. I know that is not the case and that the site is down and they don't want to take any responsibility for the problem. Like you I just want them to fix the down site and get it working again. As far as I know this feature is not discontinued. We just have to wait for them to grace us with there help by fixing there down server. So hold on there and I will do the same.
As I stated in previous: "Microsoft retired service" for fai.music.metaservices.Microsoft.com. Been within the last 2 weeks for me.
Threat to empty my library. Look, unbelievable.