How do I find an AR discrepancy for last year

Let me provide details on running the A/R report, Pene. 

We have two reports that we can utilize to find the transaction that caused the discrepancies or get the daily A/R report, either run the A/R Aging Summary Report or the A/R Aging Detail Report. 

Here's how: 

1. Go to Report, then search for Accounts Receivable Aging Detail. 
2. Click Customize.
3. Filter the necessary information of your preference. 

Same goes with A/R Aging Summary Report, you'll just need to enter the report name and customize to your preference. This way, you'll achieve the report you're looking for. 

Furthermore, you can check this article to learn how to fix the balance on a cash-based balance sheet: Resolve accounts receivable or accounts payable balances on a cash basis balance sheet in QuickBooks...

Additionally, I've added this article if you need to get started memorizing reports and save its customization: Memorize reports in QuickBooks Online.

I'll be in the comment section if you need additional assistance running reports in QuickBooks Online. I'm here to assist you. Keep safe. 

@Pene 

"At 2022 year end the AR was 325,382. When the balance sheet was done for 2023, AR was 344,446.50."

Your question references A/R balances at "2022 year-end" and "2023".  Can you clarify that?  Are you saying that you have two different A/R balances as of 12-31-22?  What two sources conflict?