Note:  The Retain Social Module was removed in Retain 4.11.

If any one else is interested in a Retain Teams Module,
    Please provide your Retain size/number for such a new Retain Teams Module and
    Vote Up this Retain Idea Exchange thread.
Thanks.

Correct,  while we haven't officially tested this we know personal chat can be archived.   Teams Channels are not.    I will leave this open until we have official support to meet the request.

I was able archive Teams personal chat, haven´t tried Teams Channel. 

  are you saying its supported because you are seeing personal chats in the conversation history?  Or all you also seeing chats from Teams Channels?

We haven't officially tested and are not officially supporting this at this time.  It is true that individual chats will show in the conversation history in outlook and get archived, but Team Channel chats should not.

We do have the Social Media Governance add on (SMG) that you can define a channel and archive into Retain.

I will keep the request at waiting for votes until we officially support both direct chats and team channel chats either directly in Retain or via SMG.