Command Prompt does not see -B optional?

[phantomBlurrr]

Hello,
I am simply trying to build my project and send the output to a different directory. The documentation says to use the -B option when running idf.py build the way I am using it is like this idf.py build -B \home\projectOutput The issue is that the latter will not build the project and instead I get this error: Error: no such option: -B

I tried reinstalling idf, reverted to 3.0, then 3.3. Tried switching to python 2.7, back to 3.0. Tried switching mbed-cli to 1.10 then updated to latest 1.10.2. Nothing has worked so far.
Any ideas?