The following provides guidance to add a centralized email footer for all Microsoft Teams Meetings. For more detail, please see link and steps below: Customize meeting invitations (IT admins) - Microsoft Teams | Microsoft Learn
Add the following in the footer section:
<span style="font-size:16px; color:242424; font-weight:600; margin-right:4px">Dial-in by Video System</span><br>From a video conferencing system please call "t.meetingID@joingw.com"<br> where you replace "meetingID" with the Meeting ID found above. <br>E.g. "t.123456789@joingw.com"<br><img src="https://www.synergysky.com/hs-fs/hubfs/navbar_logo.png" alt="Synergy SKY" width="300" height="5105">