USB isn't connecting
Check that both Macs are running macOS 10.15 or later
Use a tested USB 3.1 or 3.2 cable — not an Apple charging cable
Make sure your cable is capable of data transfer and is not labeled "charging only"
Don’t use adapters or hubs — plug the cable directly into your computers' USB ports
The data cable that ships with Apple iPads is also compatible for use with Luna Display.
Then try this:
Quit both Luna apps on both Macs
Plug in the USB cable
Relaunch the Luna apps
If Luna doesn’t connect, restart both Macs and repeat the steps above
If your devices still won’t connect, the cable may not be compatible
Ensure that the connected devices are unlocked and trusted to establish a proper connection.
💡 Tip: Plug the USB cable in before launching the apps — this improves detection.
Alternative Connection Methods
If USB is not a viable option, consider using Ethernet for a more stable connection. USB-C-to-Ethernet adapters can be used on both Macs to establish a reliable Ethernet connection.
USB disconnects after sleep
After waking from sleep, Luna may reconnect over Wi-Fi instead of USB. Quit and relaunch the Luna Secondary app to restore USB. This is a known issue we’re working to resolve in an upcoming update.
If you receive a "Cannot Use Thunderbolt Accessory" message
Your cable is not compatible. See our article: Thunderbolt Accessory Error