QB Issue Resolution:

Yes, single user licenses allow you to install on up to 2 computers for use by the same person – usually a desktop and a laptop. ┬áThe computers cannot be networked, so you’ll have to back up/restore each time you change computers – be careful with that.

Resolution for Issue 'I have a license for one user, but can I load it to a laptop for work at home in addition to the work desktop?' available: Yes (Solved).
Source: Intuit Community forum.

I have a license for one user, but can I load it to a laptop for work at home in addition to the work desktop?: 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 back up
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