Being able to open a file from Teams in it's native app is actually a feature that's locked behind a particular licensing tier. I believe it used to be availabl

Being able to open a file from Teams in it's native app is actually a feature that's locked behind a particular licensing tier. I believe it used to be available under a Microsoft 365 Business Standard or Premium license, but now you have to upgrade to an Office 365 Enterprise E3 or E5 license to be able to open it in the native application you already paid for. Microsoft's licensing structure is a special kind of nightmare.