M365 group-disable permissions for group Members to add other members

[Jas0211]

Hi, 

I created a M365 private group in the admin center.  In outlook, if I open the group, in the 'Members' tab, both group Owners and group Members have permissions to add new members. 

Is there a way I can restrict the permissions so that only owners can add new members?  

[#2]

Were you actually able to add a member as another member?

[#3]

Yes, I am currently a member in this group and I was able to add another member.

[#4]

Hm, seems I'm able to reproduce this via OWA, Outlook and Teams work as expected though. I've pinged few folks on this, but best open a support case and report it.
Out of curiosity, does the account you're using have any admin permissions?