I also upgraded to 2.3.2 and wasn’t able to reach any of my multisite subdirectories. I tried creating a new subdirectory multisite install from scratch and also couldn’t access any of the additionally created domains. It seems to be an issue for the Preferred environment 1.2.0 from what I can tell. I have since downgraded to 2.2.4 again which uses the Preferred 1.1 setup and creating a multisite works again.