Thank you for posting here in the Community. I'm here to help you access the Undo function in QuickBooks Online.
I recommend you start by verifying your access and ensure it's for an accountant. Your interface should be different from those users using the regular QBO (see screenshot below).
If you have the correct profile, let's try following these steps to verify the option. Please visit the Accounting menu and go to the Reconcile tab to perform the process.
Here's how:
Go to the Accounting menu.
Select the Reconcile tab.
Select History by account.
Select the account you want to reconcile and date range from the dropdowns.
Find the reconciliation on the list.
Select View report to open the Reconciliation Report.
Review any discrepancies and changes your client wants to make.
When you’re ready, select the dropdown ▼ in the Action column, and then select Undo.
Additionally, I've attached an article you can share with your clients if its time to redo the reconciliation on their end: Reconcile an account in QuickBooks Online.
Get back to me by leaving a comment below if you have more questions about the features and options in QuickBooks. Take care.
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