If anyone still experiences this problem (SFTP locations mounting for the user but not for root), this solved it for me:
sudo mv /root/.ssh/known_hosts /root/.ssh/old_known_hosts
(You might have an expired or invalid SSH key in /root/.ssh/known_hosts)
If anyone still experiences this problem (SFTP locations mounting for the user but not for root), this solved it for me:
sudo mv /root/. ssh/known_ hosts /root/. ssh/old_ known_hosts
(You might have an expired or invalid SSH key in /root/. ssh/known_ hosts)