On 22nd January and 29th January 2025, Coinbase wrote to all users that have old "legacy" API keys created on their Coinbase Advanced Trade accounts to say these legacy API keys will be deleted starting from 5th February.
If you are unsure if you will be affected, please search the email mailbox that is registered to your Coinbase account, you can search for any messages received from the Coinbase notification email address: info@mail.coinbase.com Additionally, the email subject line is: [Action Required] Important updates to your Coinbase API key
If you have a legacy API key connected to 3Commas, please create a new API key and update your connection in 3Commas, to ensure your trades and bots will continue to operate without interruption.