I appreciate you for providing complete details above to clarify the issue about your client list, @hisanr.
You're correct. The region plays a big role when adding your client's account under your firm. Currently, connecting to a client's QuickBooks Online (QBO) company from a different region isn't an option.
You're able to access your client's company that's based in Asia because you're added as one of its users (Company admin or Standard user).
If you wish to add more clients in QuickBooks Online Accountant, you can refer to this article for the complete details: Add a new client in QuickBooks Online Accountant. It contains steps on how to deal with clients who doesn't have QBO account and those with an existing one.
The Clients Overview tab allows you to engage with your clients company set up, banking activity, and common issues. To learn more about it, kindly refer to this article: Client Overview in QuickBooks Online Accountant.
Please let me know if you have other concerns. I'm just around to help.
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