Allowing or disallowing users with read access to create discussions
By default, organization members with read access can create discussions if a repository administrator or organization owner enables discussions for a repository owned by the organization.
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In the upper-right corner of GitHub, click your profile picture, then click Organizations.
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Select an organization by clicking on it.
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Under your organization name, click Settings. If you cannot see the "Settings" tab, select the dropdown menu, then click Settings.

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In the "Access" section of the sidebar, click Member privileges.
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In the "Admin repository permissions" section, under "Repository discussions", select or deselect Allow users with read access to create discussions.
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Click Save.