When trying to enable multi-site, I’m being forced to use a sub-directory multi-site rather than the sub-domain multi-site that I need.

This is the “reason” I’m receiving:
Because your install is in a directory, the sites in your WordPress network must use sub-directories.

I’ve tried moving it out of the default location /var/www/html to just about every other place imaginable and yet I keep having this issue – meanwhile in my local dev environment, I explicitly have wordpress in a wp folder without any issues.

Please help – I’ve wasted my whole morning on this so far.