"Namespace not found" error when trying to upsert for the first time to an index

I’m getting this error when I first try to upsert to an index using a namespace:

HTTP response body: {"code":5,"message":"Namespace not found","details":[]}

My understanding is that the namespace should be created during the first upsert: Use namespaces - Pinecone Docs

Any idea about what can be wrong?

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