A few things to try:

• OEM charger required for proper handshake; third-party may power but not charge.
• Battery wear level high; charging disabled by firmware thresholds.
• DC jack or charge controller board partially failing.
• Embedded controller/BIOS needs an update or reset (power drain reset).

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What it might be (likely causes)

• OEM vs third‑party charger mismatch
  Many laptops authenticate their own adapters (Dell/HP/Lenovo). If the brick’s ID line or USB‑C e‑marker isn’t right, the system will run on AC but refuse to charge. Background: USB Power Delivery