It seems your graphics card model is not compatible, being a GCN 1.0 generation/architecture.
This from the amd freesync FAQ,
![freesync gcn2.0.PNG freesync gcn2.0.PNG](/t5/image/serverpage/image-id/50632i211578ED3C40BC36/image-size/large?v=v2&px=999)
An old (from an article) list, note the unsupported,
![freesync not official.PNG freesync not official.PNG](/t5/image/serverpage/image-id/50633iFAB814C51066E496/image-size/large?v=v2&px=999)
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.