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Both saves used to list no sub-account and create one (a dedicated box is a second bill). Per-customer in-memory claim; the second gets 409 and nothing is saved or created. The async save + status card stays open. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS