QB Issue Resolution:

Is there any way for user to contact support by email instead of direct phone call to canada support for the validation code as it expensive for us to call directly to canada.

No there is not, their phone system is overloaded as it is from what I see mentioned here, I can’t imagine what the inbox would be like if there was an email.

Resolution for Issue 'Registration failure on new machine' available: Yes (Solved).
Source: Intuit Community forum.

Registration failure on new machine: 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 canada support
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Error Recovery for canada support [Canada]
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