Screen mirroring macOS to iPad and getting this error?: "To start Sidecar, disconnect other mirroring and AirPlay sessions." Restarting WiFi/Bluetooth on both devices may fix.
Screen mirroring macOS to iPad and getting this error?: "To start Sidecar, disconnect other mirroring and AirPlay sessions." Restarting WiFi/Bluetooth on both devices may fix.
Or can try restarting both devices, of course, or signing out of your Apple Account (iCloud) on both devices.
If you found this via Google as intended, welcome! (Apparently this is now the one page on the public web with this exact AirPlay error message written out verbatim.)