SFTP Login Issues

I’m running a brand new installation of Sympl 12 on a Mythic VM.
sftp access to web directories doesn’t work however insecure ftp is fully functional.
Anyone else come across a similar issue?

Environment

  • Sympl Version [9.0/10.0]: 12
  • Sympl Testing Version? [Yes/No] No
  • Debian Version [Buster/Stretch]: Book
  • Hardware Type? [Dedicated/Virtual/Pi] VM
  • Hosted On? [name of hosting co] Mythic