Install Sims 4 on exteral SSD Mac - HELP NEEDED

Hey y'all, I'm trying to install my sims 4 game on an exteral SSD (SanDisk Extreme Portable SSD 500GB) using a MacBook pro (2017 model).
I don't have save files or whatever I need to copy, just download the game on the SSD.
I've changed the installation path, but keep getting this error when I try to download:

"Origin is not able to download The Sims™ 4  to . Please check that the location is available or cancel and restart the download to another location."

Seems like it's not finding my SSD, even though it's quite new. I've tried re-downloading Origin, restarted everything, nothing seems to work.
I also use the SSD for work so it's not empty, but it has at least 200GB of free space available. I've also read I should create a folder on the external drive and put it in there, but it doesn't make a difference.

Any wizards that can help me out? Screenshots attached.