I have exactly the same issue!
Also PC on the same game version as you, but playing in German.
I have installed:
Cottage Livery
Cats & Dogs
Seasons
Parenthood
also the Book Nook Kit
So the only thing we have in common, extension wise, is Cats & Dogs and I do not use any mods either.
I went down Esports path, reaching Pro Gamer until I received the mysterious message, and now am unable to pass said scenario point. I tried to quit the job and get back in, but the only similar things I can get are freelance programmer or esporting. Demoting-cheat does not help either, can't seem to get it to lower than esports competitor.
I actually had a daughter near school age by the time I finally received the call, that's how long it took.
I started playing the game only recently, nothing changed since then.
