Microsoft did publish a fix. The ad is for Microsoft Teams, and how it's integrated into Windows 11. As with most of the ads that are injected into Windows, this should still pop up as a notification even if you have all notifications turned off.

Strangely the fact that Vole is serving up adverts is not getting people’s goat but how the Windows 11 shell can be so fragile that ads can crash it. Basically it means that a cloud service can break Windows 11.

Windows in 2021 has a ton of components in it that have to grab content from the cloud at any given time, from the Bing lockscreen wallpaper to Windows Update to advertisements that come from Microsoft.

Anyway it does not look like Vole is to scale back on its advertisements in Windows any time soon. Instead, it's just going to fix the glitch. Might be time to move to Linux on the desktop.