Then yes, your INTERNAL_IPS should include an entry for ‘127.0.0.1’. (It’s a string, not a number, so must be enclosed in quotes.)
I saw where you said that you had tried this before, so I’m now willing to rule this out as the likely cause of the issue you’re facing, pending verification of the REMOTE_ADDR header. (And based on your logging comment, a print statement in a view may be the easiest way to verify it. You could also look at the network tab in your browser’s developer tools to see the request.)
From the docs at Installation — Django Debug Toolbar 4.2.0 documentation, you might want to move the middleware to the top of the list.
Actually, I was just reminded you posted a link to the entire project - I’m going to pull a copy to see what happens here…