SSH Agent forwarding from Linux to Windows does not populate ssh-agent with public key

"OpenSSH for Windows" version
7.7.2.2

Server OperatingSystem
Windows Server 2019 Standard

Client OperatingSystem

What is failing
ssh agent forwarding from linux to windows

Expected output
ssh-add -l
2048 SHA256:abcdefghijklmnopqrstuvwxyz (RSA)

Actual output
ssh-add -l
The agent has no identities

I have added AllowAgentForwarding yes to the sshd_config in C:\ProgramData\ssh\sshd_config. I have tested this with both an administrative user and a non-admin user. I am able to ssh -A user@win2019host from a linux host and connect to the windows 2019 server without issue. However I am not then able to see the key in the ssh-agent.

Is this expected to work? I see conflicting documentation that AllowAgentForwarding was not supported as of 2018, however, the current documentation on docs.microsoft.com doesn't mention this as an unsupported feature.

I have attempted to set SSH_AUTH_SOCK=\\.\\pipe\openssh-ssh-agent and still ssh-add -l says it has no identities.

Just wishing to confirm if this is expected to be supported, as I haven't seen documentation that says it should not be supported. Or if it is related to the lack of Unix Domain Sockets in windows. Would be nice to use my ssh key from my linux host to pull git repo's on remote windows machines. Thanks for the response! Appreciate all the hard work.

Reproduce the Linux-to-Windows forwarding path with OpenSSH for Windows 7.7.2.2, checking C:\ProgramData\ssh\sshd_config and AllowAgentForwarding yes. Compare ssh-add -l before and after ssh -A user@win2019host, including SSH_AUTH_SOCK=\.\pipe\openssh-ssh-agent; done means forwarded identities are listed or the supported behavior is documented.