I did that already, and it didn't work (I have the same problem). :/
And if I try opening the Sims 4 it says "you need to install Origin. Origin isn't installed yet, and you need it to play the game". I already reset it, downloaded the latest version of origin, put Origin in the Applications folder, and tried to run it.
It asks me to agree with the license terms, then asks me to install the Origin Helper tool, asks me If I want origin to open when when you start the computer and that stuff, and then it asks me to log in. At that point, everything is fine. When I put my account info and try to log in, starts logging but never finishes. It stays in a white origin window forever.
Origin in macOS Sierra ran perfectly once, yes, but now it doesn't. It don't seem to be due to macOS Sierra... but I don't know why it is! I didn't do anything new in the computer since the last time it worked.. (it was a couple of days ago).
I move to another country, from South America to Germany. I thought maybe that could do have done something (regarding my account or something), but last week I played Sims 4 from here...