Applications deployed on device based collection are missing from devices.

I’ve seen this when machine policy just stops behaving correctly on the client, even though everything looks fine in the console.

On a few affected devices, I’d pick one and validate whether device policy is actually updating (not just user policy). If machine policy isn’t refreshing, device-based deployments won’t evaluate and apps start showing non-compliant even if they’re installed.

I’d also double-check nothing changed recently around boundaries or boundary groups. A small boundary change can suddenly impact a lot of devices and cause both policy and content issues at the same time.

If this started across many devices at once, I’d definitely focus on recent infra or co-management changes rather than the apps themselves.