Importing Yubikey's SSH/GPG key into a new computer
Importing the SSH key
# Mac Sequoia's `openssh` doesn't support FIDO2 resident keys.
brew install openssh
# Import the SSH key from Yubikey into the current path.
ssh-keygen -K
# Move the private key to the ssh default location for keys.
mv id_ecdsa_sk_rk ~/.ssh/id_ecdsa_sk
Importing the GPG key
# Mac doesn't include gpg by default.
brew install gnupg
# Create the stub for the secret key in your machine.
gpg --card-status
# Import the GPG key using the public file.
gpg --import key.pub