I had logged into my server using VSCode the Remote-SSH extension, and had opened the terminal.

When I enter the ls command and tab, the files and directories auto-complete. However, when I give the mv command, tab completion fails.

After some googling, this Stackoverflow answer helped.

In my .bashrc file, I had to add the following lines –

# enable bash completion in interactive shells
if ! shopt -oq posix; then
  if [ -f /usr/share/bash-completion/bash_completion ]; then
    . /usr/share/bash-completion/bash_completion
  elif [ -f /etc/bash_completion ]; then
    . /etc/bash_completion