patroklos The first thing to check is that the devices are sucessfully scanning Windows Updates, and that the Allow Drivers setting in Update Rings (which maps to ExcludeWUDriversinQualityUpdate policy) is set to allow drivers. Scanning Windows Updates is how we get the list of applicable driver updates. And if the ExcludeWUDrivers setting is enabled/configured, it will block drivers from being downloaded and installed at the client. This is working for other devices in other policies, so I'm guessing these are configured correctly, but it's worth checking. If that's not it, please open a support ticket, or DM me so I can get your tenant info and we can investigate a bit more.
LDR2688 Make sure you've enabled the Windows data collection setting in Intune. Without this being configured, we are unable to collect and process client diagnostic data, which we use to show when devices are downloading, installing, complete, or even if there's an error.