Right now, there are very few Slack and Teams integrations on the market that offer bi-directional chat and synchronization (I also understand that M.io is now focusing on its other integrations with Microsoft 365).
With full transparency, I work for Conclude, a startup that has created a Slack and Microsoft Teams integration for internal and external channel links. It was founded by Haavard Nord, who invented the app framework https://www.qt.io/ Our CTO is Lars Knoll, former Chief Architect at Qt and creator of the open-source code that became WebKit.
Conclude recently launched on the Microsoft AppSource store as well
https://appsource.microsoft.com/en-us/product/web-apps/WA200007373?ocid=GTMRewards_WhatsNewBlog_WA200007373_08292024
https://conclude.io/product/link/
https://conclude.io/product/apps/ (ticketing solution)
If you came across this page, I hope you find this helpful in some way.