Seeing the MBR error. Both drives are seen as one, so total over the 2TB OS limit.
You need to reformat both drives to GPT(uefi) due to win10 total single drive limit of 2TB in MBR (legacy) boot.
http://www.tenforums.com/ has Tutorials on converting.
My PC- Ryzen 5 5600x, B550 aorus pro ac, Hyper 212 black, 2 x 16gb F4-3600c16dgtzn kit, NM790 2TB, Nitro+RX6900XT, RM850, Win.10 Pro., LC27G55T.
