After creating a Cloud Server, the system will send an email informing User and Password to login for the first time.
After SSH Login with User and Password, the system will ask you to enter the current Password again for confirmation.
The system will force you to set a new password. After that, login with the new password again.
After SSH Login again, access the user Root with the command
sudo -i
User Root is disabled by default. Set a root password by running the command.
passwd
To enable Root Access, you will need to edit the file /etc/ssh/sshd_config
Edit the following line
#PermitRootLogin prohibit-password
with
PermitRootLogin yes
To apply new ssh config, SSH need to reload by using the command
systemctl restart sshd
Now you can SSH Login with user root.