QB Issue Resolution:

In the account register, you should have an “opening balance equity” transaction. This will likely be one of the first transactions recorded in the register and it’s essentially the beginning balance of the account. Editing this transaction to the correct amount of your actual bank balance on the date of the earliest transaction and marking it as reconciled should take care of the discrepancy between the “In QuickBooks Balance” and “Bank Balance”.

Resolution for Issue 'Quickbooks and Bank Balance not matching' available: Yes (Solved).
Source: Intuit Community forum.

Quickbooks and Bank Balance not matching: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for bank balance
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Error Recovery for bank balance [Canada]
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