QB Issue Resolution:

Perhaps you didn’t complete the registration? With QuickBooks open, look to see if QuickBooks->Register QuickBooks… menu is present If it is you most likely didn’t complete registration. Try again. If it is registered that menu will disappear.

If that doesn’t work, when the registration asks you to choose between online and phone choose “phone”. You’ll have to call Intuit to get a validation code. But sometimes Intuit’s registration servers are slow and the validation code method will work in that case (that’s what it is for).

Resolution for Issue 'Just purchased quickbooks for mac and registered, but keeps asking me to register every time I open it' available: Yes (Solved).
Source: Intuit Community forum.

Just purchased quickbooks for mac and registered, but keeps asking me to register every time I open it: 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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