I doubt that you can get an activation code for such an old program, but your only hope is to call Support.
Resolution for 'Call Support issue: 'Activate QuickBooks 2006 without going online' available: Yes.
The Call Support 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 Call Support issue yourself by looking for a resolution described in the article. If it is a complex Call Support issue or you are unable to solve the issue, you may contact us by clicking here or by using other Call Support support options.
For more information about resolving issues related to Call Support in Quickbooks/QBO or to get support for the issue 'Activate QuickBooks 2006 without going online', click the link below: