As long as you have a bank statement that you can compare the transactions in QuickBooks with, you can reconcile the account. There’s a resource that contains multiple articles to troubleshoot reconcile issues that I recommend: Reconcile Hub.
Resolution for 'Bank Statement issue: 'How to reconcile a old account?' available: Yes.
The Bank Statement 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 Bank Statement issue yourself by looking for a resolution described in the article. If it is a complex Bank Statement issue or you are unable to solve the issue, you may contact us by clicking here or by using other Bank Statement support options.
For more information about resolving issues related to Bank Statement in Quickbooks/QBO or to get support for the issue 'How to reconcile a old account?', click the link below: