Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi ,
I'm Dyari. Thanks for reaching out.
Since the reseller didn't request your personal details, they probably set up the computer using a local account or their own Microsoft account.
You can try using the Microsoft Sign-in Helper tool with any accounts you remember to check if the setup is linked to one of them.
https://support.microsoft.com/en-us/accounts-billing/manage/microsoft-account-sign-in-helper
If you still can't locate the account, your best option is to create a new user account on the computer so you can continue using it smoothly.
Please let me know if you need help with any of these steps.