Your flow credentials file is encrypted using a system-generated key.
If the system-generated key is lost for any reason, your credentials file will not be recoverable, you will have to delete it and re-enter your credentials.
You should set your own key using the 'credentialSecret' option in your settings file. Node-RED will then re-encrypt your credentials file using your chosen key the next time you deploy a change.
Welcome to the forum @dongfangwuxing
It is not clear what question you are asking.
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