Since the upgrade, my cumulative Vegas score is no longer updating.

Hi Georges, my system was on 21H1 but I've since updated to 21H2 as well as installed any other cumulative updates but the issue persists.

Yes, that is actually a record of your highest score from the game but there is no option to return this to your cumulative score since it has been reset.

You can also try reaching out to this link and see if that can still be acquired back:

https://microsoftcasualgames.zendesk.com/hc/en-us

Alright well if that didn’t work try this:

1) go to: microsoft.com/en-us/software-download/windows10

2) download the Win10 installation media tool

3) follow the on screen prompts

4) when give the choice, select upgrade

5) after it finishes “upgrading” your windows apps should work as normal.

The issue might be that you have some corrupt Windows files, so by “upgrading” you will essentially reinstall Win10 but keep your files. The only thing changing is that the upgrade will replace the corrupt files. You will also have to apply the latest windows
updates since put Win10 back to build 1803 pre-cumulative update. I hope this solution helps you with 0x80070520

Well, it's cumulative so it wouldn't effect it really. For example, if I need say 20million points for something, then I can just keep replaying any level in the game. All the points are cumulative, it doesn't just take your
best score.

I did have a read around but didn't see anything

Make sure Windows is updated. The anniversary update and any cumulative update after that is required.