A key requirement of working with shared channels in a secure manner, is to restrict access in either direction by either user or group.
This can only be done by using the object ID of the user or group from Azure Active Directory.
However, expecting an end-user to ask another end-user in another organisation what their user / object ID is, in order to provide that to their/your IT team… let’s turn the chair around and be real here: it’s not practical.
However, if we want to try making it possible at all, I’ve built an app to help with that.
It’s a simple app, it uses the Office365.Users connector to pull the user ID out from their Microsoft 365 / Azure Active Directory profile.
Feel free to download it from my GitHub repo, distribute, customise, whatever!
Also published on Medium.