Before you start...
Install the Mio app in Microsoft Teams in a specific team.
If you have an existing channel in Microsoft Teams and want to convert it to a universal channel, read this article instead.
Creating a universal channel in Microsoft Teams
Create a regular Microsoft Teams channel in the team where the Mio app is installed.
NOTE: We recommend NOT converting your team's General channel as this channel is not fully compatible with Mio universal channels. Please create a brand new channel instead.
Fill out the desired fields.
For the Channel name, name that channel the name you want the Slack people to see—it can be the same as the Team name.
Make sure Privacy is Standard (The app will not work on private channels, only public ones). Once done, click Add.
At the bottom your channel, find the "· · ·" and select Mio.
Choose the first option, Convert and invite.
Congratulations! Your Microsoft Teams channel is now a universal channel. Share the universal channel link with your external contacts so they can join you.
If you're having trouble seeing the window, you may want to check if the Microsoft Teams app was correctly installed to your team first.
Will external contacts in different channels (but in my same Microsoft Teams team) see each other's messages?
Nope. If you have separate channels for different customers, but you created them all under one Microsoft Teams team, they will not be able to read each other's messages or see other channels whatsoever.
External contacts will only have access to the universal channel that you invite them to, not the team.