Thank you for reaching out with your subscription concern regarding QuickBooks Online (QBO), dmx. I’d be happy to clarify this for you.
Each QuickBooks subscription is associated with a single company profile. If you're using the same company account on both devices, there's no need to purchase another subscription. Your existing one allows you to seamlessly access your company data across multiple devices.
However, if you ever decide to manage a different company, you will need to consider obtaining a separate subscription for that. For more information on our different plans and pricing, you can refer to this link: Plans for every kind of business.