By default, the base instance Windows OS - Servers pattern and windows OS- Desktops returns the baseboard serial number. But in some cases, the user might want to use the BIOS serial number for the CI instead.
Run Discovery on windows server using patterns.
The main CI's serial number field will have the baseboard serial used, instead of BIOS serial number, which will be incompatible with what other plugins that populate the CMDB are doing, such as SCCM.
This problem is fixed in the next upcoming release. There is no workaround available. If you are able to upgrade, review the Fixed In section to determine the latest version with a permanent fix your instance can be upgraded to.