Hello, this is Emily.
In order to sign into your Windows using a AAD (Microsoft business) account, you do need at least the Pro edition or higher. In addition to that, your company's IT needs to have set up Azure Active Directory and device management, group policy, etc to allow their users to sign into Windows using their AAD account. If you do decide to upgrade to pro, make sure you consult with your company's IT first as they may not have confugred all of that to allow it.