It is asking to use a work or school instead because you created a personal Microsoft account. If I were you, you could sign up for a Microsoft Business license (with your own domain) and use the trial to demo this.
Going forward, you could pay around $10/month for the Business license. Then you would have your own tenant, and you then have your own work or school account.
(the Microsoft 365 Business Basic is enough to get you started, and you can follow the instructions to get your own custom domain set up)
Set up Microsoft 365 Business Basic
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