The reality is that if a developer as prominent as Playground Games had released a native Android port, it would be a major news story. The Forza series is not currently on mobile devices via native install.
Stream the game if you own it on Steam or the Microsoft Store. Steam Link: Cast the game from your home PC to your phone. 🛠️ Requirements for Best Performance
Do you have an subscription or a gaming PC/Xbox console ? Do you own a bluetooth controller for your phone? What Android phone model are you using?