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It seems that you pass the wrong key to item("id","key"). When you pass undifined as key of this method, it means you don't define partition key value of document which id is '1' like this screenshot.

I guess your document which id is '1' has partition key value, so cosmos DB can't find the document which id is '1' and doesn't have partition key value. If so, you need to pass your partition key value to item("id","key").

For example, I have a document like below, my code should be like this: