Microsoft project management software used to plan, manage, and communicate a project schedule and other information among workgroup members, project managers, and other stakeholders.
Dear Robert,
Good day! Thank you for posting in Microsoft Community. We are happy to help you.
Project Plan 3 can be purchased and assigned only with work or school account.
When we talk about work accounts in Microsoft 365, it might not be what you think at first. If your username is ******@contoso.com it could be a personal or work account. You can’t always be sure just by looking at the email address. Even if you only use Microsoft credentials for work, your username is most likely considered a personal account in this context.
This user ID becomes your initial Microsoft 365 email address, just to get you started quickly. This user ID is the email address that you use to sign in and if you don’t set your domain, it will end with “.onmicrosoft.com”. For example, if your business name is Contoso, you might choose ******@contoso.onmicrosoft.com for your user ID.
For more information please check this article: What is my user ID and why do I need it for Office 365 for business? (microsoft.com)
Sincerely,
Igor | Microsoft Community Moderator
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