Please check the Type-C port of your laptop: whether the charging port of the laptop is not a Type-C port or it has a Thunderbolt 3 charging port or a full-feature Type-C port.
2. Please check the input power of your laptop: whether it exceeds the Type-C port output of our power bank support. if it exceeds, it may not be able to charge or Intermittent charging occurs. Note: Please do not use several ports of the power bank simultaneously while charging your laptop, Using several ports will split the total power so the Type-C port can not support its maximum output and provide enough power to charge your laptop.
3. Please check the cable: whether the cable you used supports PD fast charging and works normally. if not, maybe you could change another Type-C to Type-C cable and charge your laptop again.