"Edit" option of "Guest OS Customization" in a VM is greyed out.
vCloud Director version: 10.5.1.22821164 and lower
vCenter Server version: 7.0.3, 24322018, Lower and Higher
Guest OS (Open SUSE Linux 64-bit) is currently unsupported for "Guest OS Customization" due to vSphere limitation.
This issue is due to a known vSphere limitation, where Open SUSE Linux (64-bit) is not supported for Guest OS Customization.
More information can be found at: Guest OS Customization Support Matrix & https://compatibilityguide.broadcom.com/