If you are having trouble with an unknown token, the first thing to try is going to settings and clicking “Rescan Unknown Tokens”. This will allow the system to detect the unknown token and allow you to use it. If this doesn't work, you may need to manually enter the token information into the system. You will need to know the token type, name, and symbol, as well as the contract address and decimals. Once you have all this information, you can enter it into the system and the token should be recognized. If you are still having trouble, it is best to contact your wallet provider or the token issuer for more help.