Due to changes in the Twitch API, we are now relying on chat access to read Twitch events, which is why you may have stopped seeing subscriptions in your StreamElements activity feed.
A usual cause of this is that the StreamElements bot has been banned from your chat. We've implemented another service that can help in these cases but we recommend unbanning the bot to ensure everything works as expected. You can do this by simply typing /unban StreamElements in your chat (Make sure you also mod it to prevent it from being banned by other bots)
After you unban the bot, logout from the dashboard and login again with your Twitch account. This is to make sure we still have all the necessary account permissions to read subscription (and other) events.
Finally, part/join the bot from your channel to make sure it's present. You can disable all timers/commands if you don't want to use it.