FAISS Vector Store Creator - fails because of invalid API

Dear KNIMErs,

I am playing around with building a custom chatbot as laid out here: How to build a custom AI-powered job finder chatbot | KNIME

However, I already fail at the very first step, creating a vector store DB using the FAISS Vector Store Creator node.

It always returns this error:

Execute failed: Error code: 401 - {'error': {'message': 'Incorrect API key provided: sk-proj-********************************************************************************************************************************************************wrQA. You can find your API key at https://platform.openai.com/account/api-keys.', 'type': 'invalid_request_error', 'param': None, 'code': 'invalid_api_key'}}

It sounds like the API key is not correct, but I double and triple checked, created new API keys in OpenAI’s web interface (platform.openai.com), carefully made sure I really have the right ones and yet, I always get the same error. The workflow executes fine (e. g. OpenAI Authenticator node, OpenAI Embeddings Connector node) up until the point where I want to create my custom Vector DB.

Anyone else has epxerienced this?