Airplay Problem

Hello KNX_9193,

Welcome to the Apple Support Communities. It sounds like the AirPlay icon is not displaying to use Sidecar with your iPad. I'll help in any way I can.

Check out these suggestions that might help:

• Verify that your Mac and iPad meet the requirements to use Sidecar and that both devices are signed in with the same Apple ID for iCloud: Use your iPad as a second display for your Mac with Sidecar
• Turn Handoff off then back on for both devices: Use Handoff to continue a task on your other devices
• Toggle Bluetooth off and back on for both. iPad will be in Settings > Bluetooth. Mac will be in System Preferences > Bluetooth.
• Reset the user permissions that can cause issues with connection: Resolve issues caused by changing the permissions of items in your home folder
• Test in another user account: How to test an issue in another user account on your Mac
  • If the issue doesn't happen in a new user, try removing the login items on your current user: Open items automatically when you log in on Mac

If you're still having issue, contact Apple Support for further help: Contact Apple Support

Have a great day.