I cant sign my microsoft account out of my windows account

Yes, that is correct, that will remove your personal Microsoft Account from the Admin account and will not affect the account linked to your school account.

Howcome before you said not to remove anything more on the registry editor and now you say that if I do it will remove my home email from the built in admin account and not effect any other account. Wasnt my original question how to do that?

I said not to remove the last entry you provided a screenshot of, you should continue searching the registry for more entries

So which entries to i remove, and If i remove them will the Microsoft account not be on the admin account and will everything be like it was before i signed in. Also will my school account be affected and will any other accounts be affected.

I do not know what entries you are going to find in your registry, they need to be removed carefully so as not to corrupt the account.

if you are not familiar with the registry, the best option is to create a new user account and move your data to that account, that is the quick and easy solution to solve this,