Please, Can you tell me what steps did you followed in the DB server?
I SSHed into the Db Server then I banner file manually and copied the contents in it. After that I modified the /etc/ssh/sshd_config file and pointed the Banner directive to the Banner location i.e. in home directory. After that I restarted the sshd service using systemctl and then i pressed finished button and task failed. I verified by logging into the DB server again but the banner was showing fine as in the screenshot.