Hi
Checked at your and our end working already please check this video which is shared earlier http://somup.com/crhU61qbdk
Checking again at your end
Also, make sure to follow the shared video how the sharing working for both users.
Already working,Please see from your shared video
1-Invited user conatins student1 https://prnt.sc/13pu819for invitation for group "test-3"
2- Student1 invitation tab has group "test-3" invitation is https://prnt.sc/13pudpf
The concept is one sent invitation and other user's end invitation show on invitation tab.