A physical barrier results in conflicts because technology can't replace everything. Even when you are trying to communicate from far away, it isn't the same as meeting them and talking face to face. Also, technology doesn't always work correctly. There are problems with connectivity and other situations even if it was made to reduce conflicts in the physical barrier area. Time change is also a difficulty in this area.
A way to resolve this problem is to create a schedule. Figure out the time change and come to an agreement of time to talk and communicate. Nothing can replace being face to face, but visiting and FaceTime help some.
When I was younger there was a girl in my class who spoke Chinese. She didn't know any English and was put into a class with all English speakers. She was always very frustrated because she couldn't understand anything that was going on. My teacher would try to help her understand but it was difficult because she knew nothing about the language. My teacher tried labeling things in the classroom with post-it's that had English and Chinese, but she just kept getting more frustrated.
They should have placed her in a room with at least another chinease speaker to help her understand what was going on in the classroom and to help her learn English too.