SCCM - 25H2 Update (UpdatesDeployment.log Reads Applicable Update=0)

It sounds like you're experiencing issues with SCCM not deploying the 25H2 update to devices running 23H2 and 24H2. The log entry stating "Total actionable updates = 0" suggests that the client may not see the update as applicable. Here are a few things to consider:

1. Update Applicability: Ensure that the devices meet all prerequisites for the 25H2 update. If the update requires a specific configuration or service pack level that the devices do not meet, they will not be considered applicable.
2. Client Scanning: Since you mentioned that the client is scanning for updates successfully, check the WUAHandler.log for any entries that indicate the applicability state of the updates. This log will provide insight into what updates are being considered and why they might be marked as not applicable.
3. Deployment Configuration: Review the deployment settings in SCCM to confirm that the update is correctly targeted to the devices in question. Ensure that there are no deferral policies in place that might prevent the update from being applied.
4. Logs for Errors: Look into the WindowsUpdate.log and UpdatesDeployment.log for any specific error codes or messages that could provide more context on why the update is not being deployed.

If the devices are indeed eligible for the update and you still see no actionable updates, consider re-evaluating the deployment or manually triggering a software update scan on the affected devices.

References:

• Troubleshoot software update management in Configuration Manager
• Windows Update issues troubleshooting