Facebook complaint: Issues with monetization

I am having an issue with my public page. Suddenly Facebook is causing an issue with my reels. When I’m making a reel I always add music from their supposed music rights free library. Now their saying I can’t be monetized because of music rights. I spoke to them yesterday and they told me that sometimes they lose rights to music so I was told to delete my reel that receives this issue and try a different song. The problem is I have reels on my page that I’ve had for over a month and in the past couple of days this music rights issue came up. I’ve done as they told and deleted them and uploaded them again with a different song but the issue still keeps happening. I don’t understand why Facebook has music listed if you can’t use it. Am I just supposed to keep trying a different song to add until I stop getting this issue. It doesn’t make sense and I feel like this is going to cause a big problem for me.