"An error on our end caused the launch to fail. Try again later".

I'm also having this issue. I tried repairing the game but noting works. I'm adding a screenshot of the error message to my comment. 

I've had the same problem for over 2 weeks. Very annoying.

Same here! I've gotten rid of custom mods, troubleshooted the EA app two different ways & I still get the same error message. I was actually playing about 2 days ago just fine & when I tried to launch the game the following day, the error message popped up. It's so frustrating!

Same here

Same I've removed my mods nothing reinstalled them nothing uninstalled the ea app reinstalled it nothing deleted the ea cache nothing used task manager to stop EA backgrounds then manually start the game nothing make everything administrator nothing make sure all the distributibles are not only working and repaired nothing I'm lost beyond lost I want to play the game that I have spent money on but whatever they did Is not allowing me to

I've literally tried every help topic there is on Google and YouTube to try and fix this issue and nothing is working.  You would have thought that EA would have made an announcement if it was or is them, but there is nothing.  

If only inZOI had build functions oh wait it does.   Although Sims is my daughters preferred platform the longer this goes on I've a feeling that we're be moving away from EA at this rate

Same here!

Same issue

Same, I assume it has something to do with the severs being overwhelmed with Battlefield 6 players.