Force Invite People to Meetings
By default teams will not send email invitations when you schedule a meeting in a channel. It will show up in everyone's calendar but they do not get to accept or decline the meeting via email.
In addition sometimes you have a meeting already arranged when someone is then added to your team, they will not be able to see previous meetings, even if they are re-curing. You need to manually invite them to the meeting.
Step 1 - Start creating a new meeting or open the settings for an existing meeting.
Step 2 - In the attendees list, add any pupils that missed the original invite or alternatively type in the name of the team to manually invite the whole team. You should be able to search for any Team in the School and it will show up in the drop down list.
Click on the pupils name or the team name to add them to the meeting.
Step 3 - Click Send Update or Save to send the invites out