Why does my music cover get muted if it’s too long?

I made 2 covers on TikTok, one about 1 minute, the other 3 minutes. The 3 minute one got muted saying that it exceeds the duration, wtf am I supposed to do? I’ve seen 1 hour videos with background music and the entire point of my video is to have music, is there any way to fix this? TIA :)