Can't change password in LXC

[oxy]

I'm following this guide for setting up a Leap 15.0 container on Tumbleweed:
https://doc.opensuse.org/documentati...t/cha.lxc.html

The last step of setting up the rootfs doesn't work:
root # echo "root:YOURPASSWD" | chpasswd -R /PATH/TO/ROOTFS
Nothing happens after entering this line, there is no error message either. It does work locally though (echo "root:mypassword" | chpasswd)

[oxy]

This worked now:

root # chroot /PATH/TO/ROOTFS sh -c "echo '$USER:$PASS' | chpasswd"