google-auth-cookies-are-httponly-document-cookie-fails
Google’s auth cookies for NotebookLM are flagged httpOnly, making document.cookie return empty in DevTools Console. The correct extraction method is DevTools Network tab → refresh page → click first notebooklm.google.com request → Request Headers → right-click cookie: line → Copy value. This returns the full cookie string including all httpOnly cookies needed for auth.
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