Sending multimedia content and documents within chat conversations in Microsoft Teams
Oh, and one more interesting piece of the puzzle. Microsoft support suggested that maybe my network connectivity was set to block GIFS/GIPHY...except this happens on two different networks (home and office), I can use GIFs everywhere else on my computer, AND I can access GIFs in my Outlook Mail, via the App waffle.... and I can use them in Teams from my Google phone.