Since you've selected a Windows 11/2022/2025 system, is the system on the old hardware perhaps UEFI/GPT?
If so, under options for BIOS select the UEFI one, and in hardware click add, and then click to add both the EFI and the TPM-disks.
Or is it that you just didn't (correctly) select which OS it was?
If so, under options for BIOS select the UEFI one, and in hardware click add, and then click to add both the EFI and the TPM-disks.
Or is it that you just didn't (correctly) select which OS it was?