I also just needed access to my shares again, so I reactivated r/w access again (which I deactivated some time back because it did not work anymore). Now it works again (for some reason / don’t know for how long). Anyway, have a look at my user-definition in the .yml above. Maybe it helps you as well.
Sorry @Vaclav_Provaznik, somehow missed this back then. In case it’s still relevant: You can access influxdb quite nicely via chronograf (hence also included in my .yml above). I once wrote a short tutorial on this (see here).