I'm afraid im a n00b. I had installed both Dream Team and Majora's mask thinking they were legit cias, and now realize they were just generic "scene release" ones. Thanks for your help.
I found a solution. If you're on NEW3ds using pasta and can't get Majora's mask to work just get one in your region. EUR won't work for US and vice versa.
I've downloaded Majora's mask as a .3ds and converted to .cia, and later when it didn't work just a .cia premade. I haven't had any other issues installing games but im Reaaaally noobish so I would appreciate any input as to the hows/whys to get this game working on my n3dsxl.
Thanks.