question about Magic Mask

Hi everyone, i'm having a bit of trouble understanding what i'm doing wrong with magic mask. I want to remove the background from the clip, so i selected the subject and tracking when smoothly, then connected the alpha to the alpha output as many tutorials reported but, differently from them, after connecting the blu square to the blue dot of the alpha output, nothing happens upong going back to the Edit Page. I keep seeing the whole clip with the background included. Can anyone help me out please?

You have your Color and Fusion Effects bypassed by enabling this button with the line through it, click it again.

Also, I believe you need to turn off the mask preview (toggle button to the right of the +/- eye droppers.)

You're awesome! Silly me thanks a lot

Hey
Off-topic but just for information : with the pic of the girl which i displayed, a luma keyer would do the trick easily... But yes, it's in the fusion page

I actually tried luma keyer and delta keyer before approaching magic mask, but unfortunately i didn't get the same effect i usually get with blue/greenscren.

By the way i'm having a really hard time with Magic Mask tool honestly, as i genuinely can't understand whether it's me doing something wrong or it's the tool that is bugged.
I'll try to explain myself: i normally prefer to use the mask object rather than mask person, even if the subject is actually a person, as it's surprisingly more precise. Problem is that i was trying to use it with another clip i had (not this one with the girl) and whenever i use object mask and then start tracking, a windows pops up showing all the frames being analyzed and then immediately after i find myself in edit page at the beginning of the timeline and no tracking has been done. It works though if i use the person mask but it's still very unprecise and i have to keep adding + and - scribbles in order to adjust the masking, which is never as i would like, even if the scene is pretty still. It's just ridiculous...
I'm sorry to say this but i seriously hope it's me using it the wrong way otherwise it looks as bugged as f---.

EDIT: i tried to replicate the issue with a new project and i might have found out how. Basically the issue appears to happen only if i have a frozen frame from a clip and make a sequence out of it. If i apply the object mask on a standard clip it works well. Is this not a bug? Is there another workaround to apply a good mask like magic mask tool does, on a still frame that i want to use for a sequence? Please help if you can. I hope i was clear enough.