Hello @angielcm,

As of the moment, the Undo Reconciliation feature for an entire session is only available for all Accountant users using their QuickBooks Online Accountant account.

With this, let's consider manually removing your transactions from the Reconciliation window to undo them. Let me show you how.

1. Go to Accounting.
2. Select Chart of Accounts.
3. Find your bank account from the list of accounts.
4. Under ACTION, select View register.
5. Review your VAT transaction.
6. On the Check column, remove the R status.
7. Click Save.

In the same manner, here's an article you can read to learn more about how you can undo a reconciled transaction: Undo and remove transactions from reconciliations in QuickBooks Online.

However, if you still wish to accomplish your goal easily as describe by the suggestions above, let's invite your accountant to access your company data. To do so:

1. Go to the Gear icon.
2. Under Your Company, select Manage Users.
3. Select Accounting firms.
4. Click Invite.
5. Enter the name and email address of your accountant.
6. Click Save.

On top of that, I've also included this reference for a compilation of articles you can use while working with us: Learn the reconcile workflow in QuickBooks.

If there's anything else that I can help you with, please let me know in the comments below. I'll be here to lend a hand.