• Check the connection: Make sure the cable is properly connected to both the wallbox and the vehicle, and check for visible damage to the cable or connector (connectors may be dirty, damaged, or deformed).
• Try a different charger and cable: Use a different wallbox, if available, to see if the problem persists. You can try the same cable you used in the failed attempt, and then test with a different charging cable to rule out any cable failure.
• Check the vehicle settings: Check that the charging settings are configured correctly in the on-board system, and ensure the vehicle is in charging mode and that no lock or restriction settings are activated.
• Check any error messages: It's always important to check the vehicle's display and the associated app for any error codes or messages that may indicate the cause of the problem (write them down, as they're essential if you need to take the device to the repair shop to resolve the issue).
• Check for interference or environmental conditions: Make sure there's no electrical interference or power supply issues in the charging area. Sometimes the electrical system isn't designed to handle high loads and could go into protection mode, preventing power from being supplied. Also, verify that the wallbox is properly configured and functioning, including checking the configuration parameters or firmware updates.

If the problem persists after following these steps, it's advisable to proceed with a more in-depth diagnosis of the vehicle at an authorized BMW service center (in this case, it's important to report the error codes). It may be necessary to check the status of the charging socket, the communication sensors between the vehicle and the wallbox, or other internal electronic components. Always remember to follow safety precautions when charging and to contact qualified professionals for any repairs or advanced diagnostics.