You may have to cycle through the smart camera (check control settings to set it up). The camera will point to the ground right at the taxi line about 50 feet away from the front of the plane and as you move forward it will keep following it until it gets to a taxi interception and the camara will continue to focus on whatever taxi line you need to follow.
You do need to use ATC for this to work, and have ATC assign you the taxi instructions.