I need to undo the last reconciliation and I don't have this option on QBO or the ability to do so

It's nice to see you here in the Community forum, @dadl. Let me give you some details regarding the Undo reconciliation option. That way, you can reconcile your accounts seamlessly.

In QuickBooks, the Undo button in the Action column is only available in QuickBooks Online Accountant. If your accountant uses this version, you can let them undo the reconciliation on your behalf.

They have a tool that allows them to undo the entire reconciliation. If you don't have one, we can use our Find-an-Accountant tool to look for an expert near you. Once the accountant accepts the invite, they can start undoing the reconciliation.

If you prefer to do it by yourself, you need to manually edit each transaction to undo the reconciliation. 

Here's how:

1. Go back to the Gear icon at the top, then pick Chart of Accounts under Your Company column.

2. Locate the appropriate account for the transaction and select View Register in the Action column.

3. Identify the transaction to edit.

4. In the reconcile status column (indicated by a checkmark), repeatedly click the top line of the transaction to change the status, then Save.

• C - Cleared.
• R - Reconciled.
• Blank - Not cleared or reconciled.
  
  

As a reference, you can also check out this article for further guidance: How to unreconcile a transaction or undo a reconciliation.

Here are some other resources you can use in the future to manage your reconciled accounts, print reports, and troubleshoot reconciliation issues:

• Learn the reconcile workflow in QuickBooks
• How do I view, print, or export a reconciliation
• Fix issues at the end of a reconciliation in QuickBooks Online

Reach out to me again for any other reconciliation or QuickBooks concerns. I’ll get back to help and make sure you’re taken care of. Have a good one.