I have installed CentOS 8 in BIOS mode also Windows 10 is in BIOS mode and the os-prober does not see anything (I do not know if it have an output on BIOS mode).
I check centos for BIOS mode:
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[root@localhost brad]# ls /sys/firmware/
acpi dmi memmap qemu_fw_cfg
[root@localhost brad]# efibootmgr -v
EFI variables are not supported on this system.
[root@localhost brad]# efivar -l
efivar: error listing variables: Function not implemented
[root@localhost brad]# os-prober
[root@localhost brad]#
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menuentry "Windows 10" {
set root=(hd0,1)
chainloader +1
}
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grub2-mkconfig --output=/boot/grub2/grub.cfg