Unity and Firebase are looking for google-services.json with the wrong path and a backslash

Question

I'm using Firebase with Unity for the first time, and all the references I can find seem pretty straightforward, but it seems something in the code somewhere is broken and I don't know how to even find it, let alone fix it. The error I'm receiving is this:

Unable to load Firebase app options
([C:/Users/Morgan/Cards/Assets/StreamingAssets\google-services-desktop.json,
C:/Users/Morgan/Cards/Assets/StreamingAssets\google-services.json] are missing or malformed)

I have a google-services.json file, and I've been told that Firebase will look for that and make the google-services-desktop.json file for me, but I have no way of putting my file at the location it's looking for it because that's not a location that can possibly exist. I think I wouldn't be having this problem if there was even one character of difference there (I can put it in a "StreamingAssets" folder, and I tried that but it didn't work). Can anyone give me pointers on where/how to fix the path?

(Note: I'm finding a lot of questions where people are having trouble with Firebase, but none where they have this specific problem. It seems like it would be a common problem, but I've really been looking.)