I've had this problem for 12 months, now - it's finally annoyed me enough to try and sort it. I have 2 x HS100 plugs and installed them just fine. They were both capable of being toggled to "local only", or "remote control" i.e. outside of WiFi LAN.
I remember the Android app getting updated, and at some point after that I re-installed one of the two plugs. The newly installed plug no longer has the ability for me to change its "local only" / "remote control" option. The original plug is unaffected and I can happily toggle between the two modes.
Further attempts to re-install leave me in the same position. To be clear, I'm ultimaltely looking to be able to freely toggle between "local only" and "remote control".
Both devices are running on the same WiFi network and have the same firmware version.
Does anyone else suffer from this or have any advice on how to correct it?
Original device that allows me to toggle:
Re-installed device where I can no longer toggle: