Sorry, we don’t currently support connecting to a client’s QuickBooks Online company from a different region. How can I fix the above issue?

Welcome to the Community, @jacques4. I'm here to share information about the error you encounter when accepting client invites.

In QuickBooks Online (QBO), you can only accept client invites under the same region. As a workaround, you may need to ask them to invite you as a company Administrator to have access to their file. Below are the steps to perform:

1. In your QBO account, click the Gear icon.
2. Next, choose the Manage users option.
3. Then, go to the Users tab and select Add user.
4. Select Company admin then, click Next.
5. Enter the needed info and select Save.

For reference, check out this link: Add and manage users in QuickBooks Online. 

Additionally, I've added this article that provides you with the list of frequently asked questions about managing users in QBO: FAQs. 

Let me know how this goes and feel free to add a reply below. I'm always here in the Community ready to lend a hand. Have a good one. 

@jacques4 

Where is your client's location?