Powershell asking for git RSA passphrase on every pull instead of on startup?

It turns out I need to run

> ssh-add

I'm not sure why this wasn't mentioned in any of the docs on github.com.

May you need to configure Git to use the Windows 10 implementation of OpenSSH by issuing the following command in Powershell:

git config --global core.sshCommand C:/Windows/System32/OpenSSH/ssh.exe

This worked for me. Source: danieldogeanu.