Cannot run deploy playbook from within Vagrant VM

Since I’m running Windows, I have to run the playbooks from within the Vagrant VM. I got the server playbook to run perfectly. When I try to run the deployment playbook, however, it fails. It looks like what is happening is that within the VM, the agent forwarding is not running. If I try to run ssh-add -L, I get an error that it could not connect to the authentication agent. I tried running ssh-agent -s and it looks like it starts, but the ssh-add still errors out. If I do echo "$SSH_AUTH_SOCK", I get a blank. Until I can get this working, it looks like deploys won’t work. Any ideas?