After flushing the cache, cleaning data and then uninstalling and re-installing, I managed to get one of the 4 plugs registered with the app, but the others remained stubborn and didn't want to be found. I eventually gave up, unplugged them and went to bed. After coming back ~24 hrs later, I attempted to add the remaining 3 plugs and all 3 registered straight away, so now all 4 are back online. I wonder if leaving them unplugged somehow reset / refreshed the plugs ??
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