QB Issue Resolution:

No, the software ID is unique to the subscription however it will be the same for all users who have access to that subscription.

Resolution for Issue 'Is the Software ID used to setup STP unique to each user who logs in?' available: Yes (Solved).
Source: Intuit Community forum.

Is the Software ID used to setup STP unique to each user who logs in?: 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 software ID
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Error Recovery for software ID [Canada]
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