The Samsung Galaxy Tab A9+ is not compatible with the S-Pen. However, you can use third-party pens that are suitable for touchscreens. However, these pens do not offer the same functionality as the S-Pen as they do not have palmprint recognition or similar functions. Some examples of third-party pens are the Olixar Pink 3-in-1 Precision Touch Capacitive Stylus Pen or the Olixar Universal Crayon Stylus Pen.