QB Issue Resolution:

That’s a fantastic question!

Yes, more than one person can log in at a time and enter Invoices. This won’t affect any of the numbering. The only area that only one person can be in at a time is the payroll feature.

Resolution for Issue 'new to quickbooks. Can more than one person log in and create invoices at the same time? Will this affect the numbering system?' available: Yes (Solved).
Source: Intuit Community forum.

new to quickbooks. Can more than one person log in and create invoices at the same time? Will this affect the numbering system?: 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 Invoices
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Error Recovery for Invoices [Canada]
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