QB Issue Resolution:

It isn’t clear why you Merged. If these were separate Bank accounts in reality, you would never Merge them.

Yes, everything is Unreconciled, now. If they were reconciled before, they will clear now. But if these were separate accounts, there is no Statement which serves as a known ending balance.

Resolution for Issue 'I opened new checking accounts & merged from the old..when I reconcile it shows unreconciled checks & deposits from 1999 until now…how do I correct this & reconcile???' available: Yes (Solved).
Source: Intuit Community forum.

I opened new checking accounts & merged from the old..when I reconcile it shows unreconciled checks & deposits from 1999 until now…how do I correct this & reconcile???: 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 checks deposits
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Error Recovery for checks deposits [Canada]
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