A is not connecting to a . The available details do not include the model, macOS version, model, cable type, hub or use, , or fixes already tried. The exact cause cannot be narrowed down from these details alone.
Key points
The core issue is a failing to connect to a .
No model, cable, , , or attempted fix is available.
A may still need local display access during recovery.
should not be the only way to regain control of the .