This is guidance for signing into Conferences i/o Meetings from the mobile app for Microsoft Teams. 

• Note: This article is for joining meetings using Microsoft Teams the mobile app. Creating meetings with the Conferences i/o integration is only compatible with the Microsoft Teams desktop application. Editing meeting details for the Conferences i/o integrated app will not be accessible via the web app or mobile app.
• Our main Microsoft Teams article can be found in this link.

Checking for Conferences i/o in your Teams meeting

The Conferences i/o App needs to be added by a desktop/PC Teams user. Attendees can verify that Conferences i/o is enabled by checking the Teams mobile app and seeing Conferences i/o listed here:

Checking in to Conferences i/o in your Teams meeting on Teams mobile

Checking in is an important part of recording Attendance in Conferences i/o! 
Be sure to remind your attendees!

If you want to record your Conferences i/o meeting, the interface can be found in the mobile teams app and appears as below:

Your attendees can participate with engagement features in the Teams mobile app. Give it a try and test out the Polls and other engagement features that you want to use in your sessions!