Thank you for your continued feedback. We are currently working on this, and recently announced this feature for developers in Beta. For more information, please visit https://developer.microsoft.com/microsoft-teams/blogs/importing-3rd-party-platform-messages-to-microsoft-teams-is-now-available-in-beta/.
An error occurred while saving the commentAri Shinozaki commented
I'd really like our company to use Teams if we can have some cross integration or channel migration with slack. But for now we are on Slack as has extensive channels on topics we need to maintain.