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CYBER MONDAY SALE 70% OFF QuickBooks for 3 months* Ends 12/5
Buy nowHello there, @DJ_MTT.
Allow me to chime in and help you use the old invoice number for the new one.
In QuickBooks Online (QBO), if you delete the existing invoice and use the number for the new invoice.
Ensure to turn on the Custom transaction numbers to show the number of it when creating the invoices.
Here's how:

Once done, we can create a sales transaction and enter number the invoice number.

For more details, you watch a video tutorial in this article: How to change the invoice number on sales forms.
I'd like to know how you get on after trying the steps, as I want to ensure this is resolved for you. Please reply to this post and I'll get back to you. Have a great day ahead.