My accountant has informed me that I have a dozen invoices missing by number .You generate the numbers so where could they be ?

Thank you for reaching out here in the Community space.

Upon checking your post, it looks like this has been posted here. With that said, a representative has already responded to your concern and provided more information about your query. It'll be my pleasure to route you to the agent's response. See this link: https://quickbooks.intuit.com/learn-support/en-uk/transactions/re-missing-invoice-numbers/01/1262358/highlight/true#M21075

Moreover, here's an article to help you manage invoice payments inside QBO: Record invoice payments in QuickBooks Online.

I'll be more than happy to provide further assistance with this or if you have any additional QuickBooks-related concerns. I've got your back, and I'll help you out again. Stay safe, and have a nice day!