Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
I received the same error today, with a freshly created MS365 Business Basics account.
I created that account because I believed it was the cheapest way to guarantee I can write apps with the Microsoft Graph API. If it turns out I need a Visual Studio subscription, I will just give up.
I'm amazed how hard it has been to try and get started writing apps that (hope to) enrich the Microsoft ecosystem. So far, everything has felt like a beta system.