Hi [NAME],   The server COA is on the server. The support nor sales department will have any copy of the license, they do not keep a copy of it. Here's a similar post: [URL]   There is no BIOS option to reset the OS to factory. You will need to reinstall it.   Reference:  [URL]   [URL]
Hello, The R740xd came with pre-installed windows server 2019 std and i have reconfigure the non-RAID disks to RAID1 in order to install OS on it. Where can i find windows license to activate?  is there any option in BIOS to reset it to default factory in order to have the preinstalled version? Regards, kaz 
R740xd pre-installed windows server 2019