USB-C working but will not charge
USB-c works for external devices such as keyboard.
no charge.
diagnostics suggest issue with power port.
power port changed. Issue persists
MacBook Air 13″, macOS 15.1
Assuming you or the AASP has already checked the power adapter & cable, then if replacing the I/O Board did not help, then a Logic Board replacement would be next.
If your USB-C power adapter isn't charging your Mac laptop - Apple Support