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By default, Workspace Owners and Workspace Admins in an Enterprise Grid organization can invite guests to their workspaces. If you’d like more control over who can invite guests, you can adjust the preference to suit your needs. Here are the options you can choose from:
Org Owners/Admins only
Org Owners/Admins, plus Workspace Owners/Admins
Org Owners/Admins, plus select members
Note: Members who do not have permission to invite guests to your org can still request invitations. When invitation requests are approved or denied, members will receive a message from Slackbot to let them know.
Change guest invitation permissions
From your desktop, click your workspace name in the top left.
Click Settings & administration from the menu, then choose Organization settings.
From the left sidebar, select Settings. Then, click Organization Policies.