Natures Calling Quest- Playing nature sounds from any radio doesn't work.

Go to your game settings and make sure online access is ticked. That probably reset.

You should still have the station though so maybe you need to reclaim it once you have the event back.

I did as you said, and now I don't even have the Nature Calling Event or the nature station.

Try the following

- Close the game
- Rename Documents\Electronic Arts\The Sims 4 to Documents\Electronic Arts\The Sims 4_Old
- Repair the game
- Start the game. All your content will be gone now as the game created a new folder. All your saves/.. is still in the old folder so not to worry. 
- Start a new save game
- Check if you still have the error
- Report back with your results for further steps on how to get your stuff back.

I do have the station.

Hi Doxie​ 

to be sure, you have the station but it doesn't play or do you not have the station ?

If you don't have the station, make sure to claim the reward first.