A full restart can clear temporary software glitches.
If all else fails, reset Android Auto to its default settings. Sygic Not Showing On Android Auto
The fact that a $60 navigation app can be rendered invisible by a frayed charging cable is absurd. It reveals the fragile physicality beneath our wireless dreams. We have convinced ourselves that software is magic, but Sygic’s disappearance is often caused by a handshake failure so primitive it belongs in the 1990s. The car asks the phone, “Are you a media device?” The phone says, “No, I am a navigation tool.” The car shrugs. And Sygic remains a ghost. A full restart can clear temporary software glitches
What and Android OS version are you currently using? Sygic Not Showing On Android Auto