I used to connect to MacOS remote desktop using RealVNC.

I create a local port forward:

ssh -L 25900:127.0.0.1:5900 username@MAC_IP

I was than able to connect using 127.0.0.1:25900. But that stopped working after macOS upgrade. I started getting Key Length Too Large error. RealVNC does not seem to fix it event in latest version 8.5.

So I was looking for alternative client that supports macOS username login. Most clients only seem to support password only login. What worked for me was gvncviewer in WSL. The only problem is that it does not seem to support port change, so I have to use 5900 instead of 25900 for local connection.

sudo apt install gvncviewer
ssh -L 5900:127.0.0.1:5900 username@MAC_IP
gvncviewer 127.0.0.1