Google groups and google classroom

ive been tasked with creating google groups for learners in their respective subjects so that teachers can send emails to the group and add the students to their google classroom.As soon as i announced that I was finished and that teachers can go ahead, they have shown me an error: cant view group members while trying too add groups of learners to their classrooms (assuming emailing  doesnt work either)

my superior advised me to add the Teaching staff group comprised of all teachers to each subject group to solve the issue but now everyone is getting everyones meessages and invites. basically how do I make it so that All my teachers can make use of the google groups I created and at the same time not recieve messages from said group? (would have just made them all group admins but there are sensitive groups that they shouldnt have access to Hr,finance etc and there is a cap of 20  group admins) please help everyones inboxes are being bombarded 

0 1 931
1 REPLY 1

can i get an error screenshot if possible