Why do I see an "Authentication Required" popup when connecting to a Virtual Mode session?

When connecting to a Virtual Mode session, you may see a popup similar to the below prompting a user to authenticate to create a colour managed device.

This occurs when the system has not been configured to allow users to manage devices for the colord service. Normally, this is set up when enabling SystemXorg mode RealVNC Server in Virtual Mode, by running the command:

sudo vncinitconfig --enable-system-xorg

To configure the service manually, please run the below script/command block to create the necessary configuration:

cat < "/etc/polkit-1/localauthority/50-local.d/allow-colord.pkla" <<EOF
[Allow colord for all users]
Identity=unix-user:*
Action=org.freedesktop.color-manager.create-device;org.freedesktop.color-manager.create-profile;org.freedesktop.color-manager.delete-device;org.freedesktop.color-manager.delete-profile;org.freedesktop.color-manager.modify-device;org.freedesktop.color-manager.modify-profile;
ResultAny=yes
ResultInactive=auth_admin
ResultActive=yes
EOF