QB Issue Resolution:

overwrite the prompted invoice # with whatever number you wish.  QB will begin the sequence from there.

Resolution for Issue 'Can we use our own no in invoice instead of 1,2,3–?' available: Yes (Solved).
Source: Intuit Community forum.

Can we use our own no in invoice instead of 1,2,3–?: 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.

Support for begin the sequence from
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Error Recovery for begin the sequence from [Canada]
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