Itunes music cannot be converted to MP3

I wanted to download all my songs to transfer to Spotify since I figured it'd be easier than manually searching all 100+ songs again. However, I get the following error for any song I attempt to convert to MP3:

(Text: "Seeing Stars" could not be converted because protected files cannot be converted to other formats.)

For additional context, I'm not under any parental protection and am on a year-long Itunes subscription, and I am attempting to convert on a Windows 11 laptop. Any help would be appreciated!