Master Chief Collection not downloading

Hello everyone, i hope there is someone who can help me.

I opened few hors ago the MCC to play Halo3 but it didn't dowload yet, so i closed it. About an hour later i opened the xbox app hoping it would start the download and that's when my problems started.

I could have hit "play" but nothing would happed. Then i deinstalled and now when i try to reinstall the download just stops itself. There is no error message popping out, the only ones i get are from the specific halo's game that the master chief collection
is trying to download, they say i don't have the main program (indeed, i don't have the mcc downloaded so i guess the problem is that). But the mcc itself won't start the dowlonad.

Anyone has any idea how to solve this or hints? I am sure i have enough space on the disco. Might it be some registry problem? I really have no clue.

Thank you in advance.

EDIT: to add some informations. I have bought "Game Pass Ultimate", i have no idea if this is relevant

:)