Location of smsts.log file during SCCM OSD
The "smsts.log" records all the activities during SCCM operating system deployment and you should look into this log file as a first...
Location of smsts.log file during SCCM OSD
SCCM Software Distribution Troubleshooting
Troubleshooting System Center Endpoint Protection (SCEP) Client
SQL Query to Get Maintenance Window for member of specific collection | SCCM | ConfigMgr
Configuration Manager: Slow Operating System Deployment (OSD) caused by IPv6 6to4 tunnel adapter
SCCM WSUS sync error – Sync Failed – WSUS server not configured