Reconciliation after migration

We are a non profit and migrated from Desktop on a Mac  to Online Essentials. When we migrated, we ran financial reports before and after for comparison and all matched. When we tried to do the first bank reconciliation, the beginning BANK STATEMENT balance shows zero instead of the last bank balance reconciled on desktop. The software does not allow an edit to that balance. I’ve talked to three employees at intuit and each wants me to make a JV entry adding an opening equity balance. However, that is not the proper fix because it adds the bank balance to the cash book balance and results in a duplication to the book balance in the general ledger. We don’t need a correction to the books at all. We need a correction to the reconciliation window which shows the incorrect previously reconciled BANK balance. Also, I noticed that previous cash entries already reconciled prior to the migration do not show a C or R. And I see that the conversion does not carryover the previous reconciliations. I considered re-doing the migration, but I’m unsure how that would affect the entries made since the migration.  I’m hoping someone can address this issue since I’m at a loss as to how to proceed.