The root cause for this problem is that Microsoft Teams is not a default connector from Power BI desktop. As you know, the workaround is to use SharePoint. SharePoint connectors are available in Power BI desktop.
Many people discuss about this question in Power BI community. You could know more information from this link.
Aa we are mainly responsible for general problem of Microsoft Teams, your question is more related to Power BI. For the related questions about Power BI, you can ask in here. Thanks for your understanding.
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