First things first. Is the remote plug-in enabled for both installations.
If it is, the next thing to try would be to try accessing the remote web interfacr using the android browser. The information you will need for this should be on the remote plugin settings page.
If you can access the web interface, then its probably a bug in the app. It is still in the early stages, and I have had issues with it working some times and not others.
Let us know what if anything works.
P.s. I havn't got a p.c. in front of me, so the details may not be exact.