I'm having this issue but not with the Social Media Career - my Sim is a stylist and her task is to go to the park or gym and check in... neither option comes up. She can update social media or Simstagram but nothing else. Guess she won't complete her work at home task today.
I do not have any mods or custom content in my game. I did a repair through origin and same issue.
I had this problem too, but I learned that it isn't actually an option. You check in by going to the location and talking to other sims about fashion or interviewing them, really any option under interaction that has the stylist icon next to it.
