How to get two users with different authority to log in the same session on different devices?

I want to have a template that can be accessed by two users (admin and guest). An admin has the authority to access more buttons than a guest. I also want the admin and guest to be able to access the template in the same session on different devices. I have tried to make this happen using mdashboard. I have managed to make the admin and guest log in the same session on two different devices (using 1 network router). But when the browser is refreshed on the admin device, the browser shows the template accessed by the guest. How do I get two users with different authority to log in the same session on different devices?

If you are using mdashboard rather than the
dashboard node you will probably have to contact the author for support as it isn’t anywhere near as widely used.