It seems your graphics card model is not compatible, being a GCN 1.0 generation/architecture.
This from the amd freesync FAQ,
An old (from an article) list, note the unsupported,
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..