To assist you better, could you please clarify whether your reconciliation is failing to complete, showing an unexpected difference, or if you're experiencing a different issue entirely? Any additional information would help us tailor our support to your specific needs.
If you're reconciling an account in QuickBooks Online for the first time and find that the balance is incorrect, it's often due to an incorrect opening balance. The opening balance is the starting point for your account in QuickBooks. QuickBooks sets this starting point based on your real-world account balance from the day you choose to begin tracking transactions.
To find and correct the opening balance for the account you need to reconcile, here's what you need to do:
Review the opening balance in QuickBooks.
Compare the opening balance with your actual account balance.