QB Issue Resolution:

You’re getting a 0.00 starting balance because after the conversion nothing at all is reconciled.

Yes, this is how the conversion “works”.  QB Online could of course keep the reconciled things reconciled, but it doesn’t. Intuit could fix this anytime, but they haven’t.  It’s been like this for years.

 

The fix is to enter your ending balance from your last bank statement, then mark everything from the beginning of time that has cleared through that statement in one huge reconcile; mark everything except for the things not cleared as of your most recent statement.  Then the ending balance should match that statement’s balance.

Resolution for Issue 'Reconciling an acc’t after transition from QBOL to Desktop' available: Yes (Solved).
Source: Intuit Community forum.

Reconciling an acc’t after transition from QBOL to Desktop: 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.

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