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You can create chat between any group of people that you want and then rename the chat to have a name, but that’s not a channel and it’s not a team and it doesn’t really have a full-fledged files area, though you can share files in a rudimentary way.

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I had a problem where it was not possible to include people from different organisations. Once you have more than one external organisation involved, I have to manage how they join and whether "external" or "guest". This makes it difficult or even impossible to set up the channel/chat with the people you want. This is entirely a Teams limitation.

Slack does not have these artificial barriers. You can invite single channel guests, or add them as full-fledged members. It's simple and logical.

We often use meeting chats for these kinds of channels. Meetings that happened months ago sometimes.

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