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QuickBooks Online accepts and downloads transactions based on what and how your bank shares with us. Let me help you get this working by sharing the available you have.
Since your transactions are directly downloaded from your parent account, you don't need to connect your sub-accounts anymore.
Feel free to read this article for more details: About
Bank or Credit Card Sub-account Setup.
If you have any other questions, feel free to comment below. We're always here to help you.