QB Issue Resolution:

you can enable account numbers in company settings at any time, and use them or not as you wish.

Resolution for Issue 'Chart of Accounts – selecting Account numbers: Can I decide later to use Account numbers if I decide I need them, or do I need to do it from the beginning?' available: Yes (Solved).
Source: Intuit Community forum.

Chart of Accounts – selecting Account numbers: Can I decide later to use Account numbers if I decide I need them, or do I need to do it from the beginning?: 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 Chart of Accounts
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Error Recovery for Chart of Accounts [Canada]
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