Let me help you get around your concern, Mark.

Your accountant should be in the same region as you. If their account is set up to a different one, they'll need a different email address than the one they're using for their QBOA account. This way, you can add them. 

You can also check the article provided by Mark_R to help you set up your accountant. 

Feel free to let us know if you have other concerns. We'll be right here to assist you. Take care!