In projects inclined to the Microsoft ecosystem, Teams is probably the best collaboration option, especially if your team members are dislocated. Probably because using different Office 365 accounts i had a hard time getting the Teams-Addin to work with Outlook. This is a know problem as you can find numerous articles on the web from people asking for help about this issue. Microsoft is working to enhance the Teams / Outlook experience.
One especially helpful article was Missing Teams Outlook Add-in by Michael LaMontagne (@RealTimeUC). Michael was the only one trying to dig deeper into the nitty-gritty details of COM-registration between Outlook and the Teams .NET application, deployed using Squirrel.Windows (as most Electron-based desktop-apps on Windows, e.g. Slack etc.).
He finally got the Teams-AddIn working by duplicating registry keys from a working machine. However, after reviewing the Teams & Teams