QB Issue Resolution:

Thank you for your question!

What you have described is exactly how it does work.

You must create a new invoice with the number you want to start from rather than edit an existing one.

The next invoice should then follow on sequentially.

If I have not been able to answer your question please consider calling our customer support at https://help.quickbooks.intuit.com/en_GB/contact by clicking on a topic, then Call.

Resolution for Issue 'How do I set a starting invoice number so it is sequential from last one used in QB Desktop, and then subsequent invoices “count up” ?' available: Yes (Solved).
Source: Intuit Community forum.

How do I set a starting invoice number so it is sequential from last one used in QB Desktop, and then subsequent invoices “count up” ?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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