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Try these steps:

1. Confirm the dock's power adapter is connected (if the dock has external power).
2. For bus-powered docks, ensure the host cable is firmly connected to the computer's USB-C/Thunderbolt port.
3. Try a different port on the computer.
4. Try a different USB-C or Thunderbolt cable if using a cable connection.
5. Check System Information for dock enumeration.