I have a Tapo RV20 Max robot vacuum, and the water tank is not dispensing water. I have already followed all the recommended troubleshooting steps available online, but the issue is still not resolved. I also tried gently moving the black rubber plug in different directions in case there was an air blockage, but this did not help.

Before attempting anything further, I would like to confirm whether it is safe to open the black rubber plug and use a small tool to release trapped air — without puncturing or damaging the rubber — or if this approach is not recommended for this model. I want to ensure I do not cause any harm to the device.