Hi sariel jan,
From your description, it seems that you have bought a new computer but when you tried to login Office desktop apps, it prompted the error code 80180014.
In this situation, according to the error message you encountered, I have checked in community and also searched a lot online, this error usually occurs when tenant end users try to add their work/school account to Windows but cannot enroll their personal device to Azure AD. Occasionally, the system credential cache from local environment may also affect with such an error, but since I noticed you mentioned it is a brand-new computer, I believe this is not the cause. (But I'm happy to provide you the related troubleshooting steps about cleaning local credential if you want, just let me know.)
Given this situation, it is strongly suggested to refer to this official article: Troubleshooting Windows device enrollment problems in Intune - Intune | Microsoft Docs and contact IT admin in your organization to check and confirm if there have recently changed the related settings that not enabled Windows MDM enrollment in the school Intune tenant. If so, it requires admins to go to Microsoft Endpoint Manager admin center to change the settings so that students can activate their account on personal devices without such blocking policy.
From my experience, this kind of tenant policy setting will be applied for all end users. Hence, at the same time you send email to school IT department or contact the school admin, you can also confirm with some other students in your class and ask if their account can sign in local Office apps from personal devices.
Reference: Fixing error 80180014 when connecting school account - Microsoft Q&A
How do I find my Microsoft 365 admin? - Microsoft Support
Please correct me if I made any misunderstanding and I will be here waiting for your updates.
Appreciate your time and patience. Hope you a nice day and stay safe!
Best Regards,
Mia