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I'd recommend inviting your accountant to undo the reconciled period.
Once your accountant accepted the invitation, he/she can start to undo your reconciliation.
Let me show you how to undo reconciliation in the Quickbooks Online Accountant(QBOA) version.
For more helpful reconciliation topics, feel free to read this article: Learn the reconcile workflow in QuickBooks.
Let me know if you need anything else. Stay inside and stay safe, @1youthwithoutlim.