Hello,
I working with the Microsoft Edge Dev browser (the last updated) and Microsoft Teams onLine with an Office365 account. I uploaded a Word file (docx) in a team and if I want to open the file in Word Online (the Microsoft Teams document viewer) or in Sharepoint, I have a viewing issue. You can see black screen here https://drive.google.com/file/d/1DGRqx7NBaHWRozjWyeADljfePtXaMlcK/view?usp=sharing
It doesn't work with Office documents neither (Word, Excel PowerPoint files).
But it works with older Office documents format (which are not built with openxml structure). So I supposed there is an issue for viewing openxml documents in Microsoft Teams with Microsoft Edge Dev browser.
I don't know if it's the right place to post that issue. I also post this article in Stackoverflow.com
Thanks for considering it.