WE HAVE DOUBLICATE INVOICE WITHOUT KNOW WHOS THE USER ADDED ITS NOT MENTION IN ACTIVITY

I'm here to make sure you can identify the source of the duplicate invoices in QuickBooks Online (QBO), jazavclub-gmail. 

Just to clarify, are you referring to the Audit log? If so, this tool will sort changes made on a particular transaction.

If the user who added the duplicate invoice isn't displayed, we can perform some troubleshooting steps to fix this. There are times when the browser is full of frequently accessed page resources, which causes some errors or unusual responses. 

Let's start accessing your account using a different or private browser. You can use either of these shortcut keys:

• Google Chrome: Ctrl + Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Microsoft Edge: Ctrl + Shift + P
• Safari: Command + Shift + N

Once logged in, try to run the audit log again. If it works, I recommend clearing your browser's cache. Doing so will remove the historical data and access QuickBooks with a clean slate. You can also switch to a different supported browser.

I've added this article for additional insight into the Audit Log, such as what information is tracked: The Audit Log: What it is, and how to use it.

If you have any other follow-up questions about your invoice transactions, please let me know by adding a comment below. I'm more than happy to help. Have a good one!