Windows 10: My PC is asking me to sign in with a email to a school I don't go to,

My PC is asking me to sign in with a email to a school I don't go to, I bought it off of Amazon and it worked before I reset it to remove the files off my PC because I thought I had a virus. Now I have no clue what to do I cannot contact the seller since I have no idea where my mom got it from on Amazon please help me with this situation because I don't know if I will have to get a new PC or not this is really infuriating.

:)

 

Onedrive asking to sign in to a school account

Hello, A few years ago, I lost access to my school email and had to create a new personal email for windows. My files sync fine with the new email, but once a day, I get a prompt asking me to sign into sharepoint and when I click the button to sign in, the only option I have is for the school account which I don't have access to. I deleted everything that started with Microsoft Office from credential manager that didn't have my personal email in the username field, ran the command C:\Program Files\Microsoft OneDrive\onedrive.exe /reset to reset onedrive, and uninstalled/reinstalled onedrive to no avail. Does anyone know what I missed here or why my school account is still connected? EDIT: I saw a SSO_POP_User credential that I missed in credential manager. Maybe that will fix it. I just unlinked and link my account and wasn't prompted to sign in; however, when the select an account prompt comes up, the school email appears in the list of options.

 

Setting up Exchange on Andriod with school Office 365 account

It depends if your school has blocked access for setting up on mobile device email clients. Contact your school or ask an instructor if they have a step-by-step guide to setup up on a mobile client if allowed.

 

Sign in to Hidden local user

I have installed windows 10 on a Computer Lab PC, and the starting account was Local account, my supervisor asked me to Hide the local account that was first created because it’s an Admin by default and let a student sign in with his school email address, but Now I have to install some programs and it asks me to sign in as admin of course, while I can’t sign in from the lock screen because the admin is hidden, and I cannot show it because The student school Email doesn’t have access to do that ! So is there is a command to write or a name when it prompts me to sign in as Administrator?
What I tried:

1. Someone told me you can write”./username” and the password but it didn’t work, while I know the username and the PC Name too.
   
2. Tried to show the default Administrator account from the Computer Management window but I didn’t have access to do that.
   

Sorry for the long text. And thanks in advance.