public Boolean updatePlayerPrimaryGroup(String username, String desiredGroup) {

        // Get an OfflinePlayer object for the player
        OfflinePlayer player = OmhmsMcPlugin.getInstance().getServer().getOfflinePlayer(Objects.requireNonNull(Bukkit.getPlayerUniqueId(username)));

        // Player not known?
        if (player == null || !player.hasPlayedBefore()) {
            if (debug) {
                Logger.info(username +  " has never joined the server!");
            }
            return false;
        }

        // Get a group object for the group name.
        Group group = api.getGroupManager().getGroup(desiredGroup);

        // Group doesn't exist?
        if (group == null) {
            if (debug) {
                Logger.info(desiredGroup +  " does not exist!");
            }
            return false;
        }

        // Load, modify & save the user in LuckPerms.
        api.getUserManager().modifyUser(player.getUniqueId(), (User user) -> {

            // Remove all other inherited groups the user had before.
            user.data().clear(NodeType.INHERITANCE::matches);

            // Create a node to add to the player.
            Node node = InheritanceNode.builder(group).build();

            // Add the node to the user.
            user.data().add(node);

            // Tell the sender.
            if (debug) {
                Logger.info(user.getUsername() + " is now in group " + group.getDisplayName());
            }

        });

        return true;
    }