Program exit code 259

in the Execmgr.log you have a line that means “Program exit code 259”

i have never heard from this Program Exit Code in SCCM!

On the Technet you can find this Forum-Post:

Technet Post

In Short: This Code are from the Vendor not from the ConfigMgr, so in Tasksequence you can give this Code in the Line as like a Failure 3010
to test it.
259 is like a pending reboot from the Vendor-site

But in normal you can ignore this code as a success install.

Have fun, no guarantee