Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello
Go to Settings > Apps > Installed Apps, uninstall the Microsoft 365.
Then restart the computer, and use this instruction to reinstall as business.
Please go to https://www.office.com
Sign into the Microsoft account you used for the subscription. This is not your personal account credential. When you set up the business subscription, you should have set up an user in this format: username @ business.onmicrosoft.com , where username and busienss were defined by you.
Click on Apps on the left.
Then on the upper right, click on "Install apps". This will now download the installer file. Once downloaded, click on the file to install. It will install the Desktop version of the apps for you then.