Blocked/Locked out of my business computer and my outlook business email has been blocked

[Windows Server]

My business computer is locked by an admin that did not set it up my computer but had access to set up the outlook account. Now I cannot access my computer when I put in my pin code as it is locked. When I attempted to change the password, it says I have been blocked. Additionally, how can I gain access to my business outlook email? I am the owner of the school, and the institution is regulated by the state and government. My outlook is an .edu account and I have time sensitive emails that I must respond, to I am not in contact with the individual that set up the account. Is there solution to

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