Are you using gnome-keyring? (I think that's the default).
If so, gnome-keyring doesn't actually implement ssh-agent locking although it will claim to work.
https://git.gnome.org/browse/gnome-keyring/tree/daemon/ssh-agent/gkd-ssh-agent-ops.c#n1417
op_not_implemented_success, /* GKR_SSH_OP_LOCK */ op_not_implemented_success, /* GKR_SSH_OP_UNLOCK */
Are you using gnome-keyring? (I think that's the default).
If so, gnome-keyring doesn't actually implement ssh-agent locking although it will claim to work.
https:/ /git.gnome. org/browse/ gnome-keyring/ tree/daemon/ ssh-agent/ gkd-ssh- agent-ops. c#n1417
op_ not_implemented _success, /* GKR_SSH_OP_LOCK */ not_implemented _success, /* GKR_SSH_OP_UNLOCK */
op_