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Welcome to the Community, @kdemers-kdlawpc-.
In QuickBooks Online (QBO), you can change the beginning balance in the register to make sure it's accurate. This can be done by going to the Chart of Accounts.
In case you encounter issues when you reconcile an account, I suggest checking out this article for further guidance: Fix beginning balance issues if you've reconciled the account in the past QuickBooks Online.
Also, here are some helpful references that you can check out about the account balance, like how to fix discrepancies:
Please leave a comment in this thread if you have any other questions or concerns. I'll be here to help. Have a great weekend!