Praise whatever deity you believe in, because it’s finally here, a tenant switcher for Microsoft Fabric (which includes Power BI). A what? Let me explain. When you have a organization with multiple tenants in Azure (also called directories in some products like Azure Devops), or you’re a consultant like me who works with multiple clients (with each their own tenants), it’s possible that you can log into multiple tenants using the same email address. This can happen if your user account was added as an external user to another tenant.
This has been a real pain, and unfortunately, that pain still exists for Power BI Desktop.