From a security perspective, the ability to invite members to a group is restricted to the workspace admins. This is because only admins have the authority to invite anyone to the workspace in the first place.
Group admins, who are not workspace admins, therefore cannot invite members to a group by themselves.
To invite members to a group, a workspace admin should follow the steps below:
Open the OSlash dashboard (use o/ + enter in the address bar)
Go to Teams in the sidebar
Head to the Groups tab
Select the group you want to invite a person to. This opens Group Details in the app window
You will see an invite link at the bottom of the window. Copy the invite link and share it with the desired people to add them to the group.
Alternatively, you can also follow this sequence:
Open the OSlash dashboard (use o/ + enter in the address bar)
Go to Teams in the sidebar
Head to the Groups tab
Click on the three dots next to the relevant group and select Edit
You will see an option to create an invite link at the bottom of the window. Copy the invite link and share it with the desired people to add them to the group.