When you see 'Could not find a key matching the given X-BFX-APIKEY' in your trading bot for Bitfinex, it means the API Key no longer exists.
Create new API Keys to continue trading. Refer to the article 'How to connect with Bitfinex with API keys' for more information.
Example error message from the Bitfinex trading bot output:
04/16/2024 12:53:43 AM ERROR Could not find a key matching the given X-BFX-APIKEY.