Hi,

Maybe I'm wrong, by chance for the installation of your system you used the so-called "Intelligent Provisioning", in this case that has already been discussed on this forum (and other) the installation process sets a default password as written here: https://support.hpe.com/hpesc/public/docDisplay?docId=a00112754en_us&page=s_config-os-setting.html in particular: The default password for EXSi 6.x and 7.x is _Passw0rd_

If I'm not mistaken, consult the HCL to be sure, the DL360G10 system should be supported up to ESXi 8.0U1.

Regards,
Ferdinando