Hi, please try these steps:
1.Please confirm the Auto-Add Detergent function in docking setting is turned on. If not, please enable this function.
2.Please reinstall the  auto-detergent compartment to ensure it's properly secured in place and run a mopping pad cleaning task and observe the used water tank condition after completion.
3.Please check if there are foam bubbles in the used water tank by shaking the tank after the cleaning task.
4.If no foam appears in the wastewater tank after completing these steps, please provide us with:
a. A complete video of your operation
b. Your robot's serial number (SN):on the back of the robot
5.Please shake the cleaning solution box to verify if liquid dispenses normally.