After ghost upgrade -sftp now asking for password

I have a Ghost (Ubuntu 18.04) instance hosted at DigitalOcean.
After updating from ghost 3.5 to 3.35.5 my sftp (FileZilla SSH) connection is now asking me for a password.

I referenced the resources below but I am stuck. Does anyone have any suggestions or thoughts?

https://www.digitalocean.com/community/questions/sftp-now-asking-for-password
https://www.digitalocean.com/docs/droplets/resources/troubleshooting-ssh/connectivity/