ssh-copy-id does not work out of the box for dropbear. The issue is that dropbear may only have one authorizedKeys file while openssh handles this file for each user. To fix it symlink the root users authorizedKeys file to the dropbear one.
openwrt>> ln -s /root/.ssh/authorized_keys /etc/dropbear/
remote>>> ssh-copy-id root@openwrt
There, you fixed it
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