QB Issue Resolution:

Once you register online you are registered and registration is normally inaccessible. Don’t know why you’d want to register again? If you want to unregister a copy there is an option for it under the QuickBooks->Manage License->Reauthorize this Computer.

Resolution for Issue 'How can I choose the register by phone option once I have tried online registration?' available: Yes (Solved).
Source: Intuit Community forum.

How can I choose the register by phone option once I have tried online registration?: 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 Online Registration
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Error Recovery for Online Registration [Canada]
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