I tried using this integration with an Enterprise tenant and found that it was not available. I contacted Mindmeister support and received the following reply:
I'm afraid that the decision to only support Education and Business licenses was not up to us but rather a change of policy made directly by Microsoft. We therefore, cannot guarantee that our integration will ever be available for the enterprise license.
While it isn't mentioned in this article, there is a statement about only supporting Business and Education accounts in the original 2017 announcement.
Please note: Currently only Microsoft Business and Education accounts can use our Office 365 login and therefore the integration with Microsoft Teams. So called Microsoft Accounts (previously called Microsoft Live Accounts) can’t access the Office 365 login, thus Office 365 Home subscriptions can’t use it either.
Is there a specific reason that Enterprise accounts cannot use this integration, or plans to support it in the future?