Tech Support people are often wrong in their answers.  If you want to be strictly legal, go with the EULA requirements.

https://quickbooks.intuit.com/qb/products/pro_premier_shared/tabs/faqs/pro_premier_faq_section6_mult…

Resolution for 'between EULA issue: 'License requirement inconsistent between EULA and tech support phone line.' available: Yes.

The between EULA 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 between EULA issue yourself by looking for a resolution described in the article. If it is a complex between EULA issue or you are unable to solve the issue, you may contact us by clicking here or by using other between EULA support options.

For more information about resolving issues related to between EULA in Quickbooks/QBO or to get support for the issue 'License requirement inconsistent between EULA and tech support phone line.', click the link below: