Hi @G7,
Currently, there isn't an option to pull up a report with a transaction confirmation number in Quickbooks Online.
In addition, QuickBooks Online only syncs and accepts transactions with Bill.com.
With this, I suggest contacting their customer care support. This way, you'll be informed with the availability of the report you need and be guided in pulling it up.
For your reference, I've included our detailed guide about what is bill.com.
Feel free to leave a comment below if you have any other questions about QuickBooks. It'll be always my pleasure to help.