How to activate Wuthering Waves UID Top-Up?

Activating your Wuthering Waves UID Top-Up could not be easier. Simply follow these few steps:

• Provide the seller with your UID and server you play on: SEA/ASIA/EU/TW/ US
  

The key is not working

If you have activated the key according to the guide but the code appears not to work, please check what type of error message you receive and depending on it follow the appropriate instructions:  

• My key is Duplicated / Already used
• My key is Invalid
• My key is region locked / can't be activated in my country
• My key activated a different product
• My key did not activate all of the content