If your Apple 12 Mini is unable to charge, you can try the following steps:
1. Check whether the charger and cable are intact. If they look worn or damaged in any way, they may need to be replaced.
2. Check the charging port for foreign objects. If there is dust or small debris accumulated in the charging mouth, it may hinder charging.
3. Try using a different charger or cable for charging. Some chargers and cables may not be compatible with your device, so try using another set to check if you can fix the problem.
4. Restart the device. Sometimes, by restarting the device, it is possible to solve the problem of the device not being able to charge.
If the above steps do not resolve the problem, please contact Apple customer service for technical support or go to an Apple authorized service provider for repair.
Charger problem, you first replace the charger, exclude is not the simplest external charger problem? If it doesn't work, you have to find someone to replace the phone
It may be that the data cable is broken, and it is recommended to replace it