Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Dear Catriona P,
Welcome to the Microsoft Q&A forum.
Thank you for sharing the details of your issue. Based on the information you provided, it seems that you are unable to sign in to your Windows profile because it is requesting administrator permissions.
To help you set up your device correctly, please start by signing in with your personal Microsoft account to finish the initial Windows setup. After that, you can still use all Microsoft 365 services, such as SharePoint, Teams, and OneDrive, by signing in with your business account inside each app. You will also be able to download and use the Office desktop apps without any problems.
If you want to sign in to Windows directly with your business account, the device must be Microsoft Entra joined and managed by your organization. You can find more details here: What is a Microsoft Entra joined device? - Microsoft Entra ID | Microsoft Learn
However, since you mentioned that you are the only person in your company, I would strongly recommend using your personal account to sign in to Windows. This gives you full admin control of the device, and in this case, using a business account for the Windows login is not necessary.
Please feel free to let me know if you have any further questions or concerns. I’m happy to assist.
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