Are life experience degree awarding universities accredited ? Is capitol university accredited ? Can I use the mba certificate to get a job in usa or london or nigeria.

Life experience degrees are not accredited. You might manage a job with a diploma mill degree, but you may also lose your job real quick when management realizes you don't have the education that you should have received with a real MBA.

Within the US there is no accedited degrees that are life experience.

Capitol University of course is not in the US but based outside the US.
So I can 't say what london or nigeria may accepted but in the US, they look at at schools accedited by the US government