Hello there, UnaYang.
If you have multiple companies in different countries, you'll have to sign up for QuickBooks Online on the County where your companies are located. Thus, if you only have one company with multiple users in different countries, you can use the multi-person system in one region.
Also, you can check the QuickBooks Online subscription for more information.
Let me know if you have additional questions. I'd be right here anytime.
