Windows Partition on Migrated bootcamp drive not bootable

Good day,

I migrated a 1Tb bootcamp laptop drive to a 1Tb SSD. all partitions have been created and the sizes are correct. On reboot, only the Mac OS partition is bootable.

the new "image" of the drive shows the volume as NTFS, but it does not have a drive letter assigned to it, nor does it have the windows logo on the partition.

How do I get this drive to be bootable so that i can replace the onboard drive with the new SSD?

thanks in advance