Answer
Search for 'Applications' in the relevant admin/configuration area and look for (or add) 'NotifyMe' there. If it isn't showing as active, try activating it specifically via the Touch App Server (TAS) configuration instead. For NotifyMe to even show up as available to activate this way, its DLL needs to be present in the correct folder on the TAS Server — if the DLL isn't placed correctly there, the application won't be selectable/activatable at all, which is a common reason the setup doesn't take even when the documented steps were otherwise followed correctly.