I have a question about Windows Movie Maker rights and monetization on YouTube. (I'm a YouTube partner with Adsense)

I made a video using WMM that contains *only* my own original content (video I took of myself, pictures I took of something I made, and some original music I recorded myself playing). When I tried to monetize the video, YouTube asked me to "provide proof of commercial use rights" and suggested I provide the "link to software license terms (if any)"

I know that a huge amount of people monetizing their videos made them with WMM, but I cannot for the life of me find a link to software license terms that state I can use videos I make on WMM for commercial purposes (provided I don't use clip art, other people's music, etc.)

Please help! I'm getting very frustrated and this is pretty much the last thing I can think of to try! I have a decently successful YouTube channel and have been uploading and monetizing videos just like this up until a few days ago when YouTube suddenly wanted proof of commercial use rights. Now that I can't monetize videos, it's literally losing me money every day.

P.S. There was no topic related to license terms, so I had to pick this topic. Let me know if there's a better place to post this question.