Problem with TP-Link HS110 smart plug: it switches off but not on
I have connected a TP-Link HS110 smart plug to OhmConnect and it is shown on https://login.ohmconnect.com/connect.
There are two problems:
If I try to switch the plug off and on using the "Toggle Device" button on OhmConnect's "Connect" page, switching off works but switching on doesn't. OhmConnect's "Connect" page shows "Status: On" but the plug doesn't actually switch back on. However, switching the plug back on using Kasa from Android works OK. (It works from Kasa whether the Android device is on or off the wifi network, so presumably TP-Link's remote control is working successfully.)
Any ideas what is going wrong here?
So far, OhmConnect has not switched off the plug when an OhmHour has occurred. This has happened twice.
When should I expect OhmConnect to switch the plug off for an OhmHour? Should this happen on the hour, or some number of minutes before, or might it occur a few minutes after the start of the hour?