The following article describes two possible solutions when Access Request Settings are missing from Site Settings>Site Permissions.



Missing Outgoing Email Settings

When you navigate to the Site Settings > Site permissions and see the following view:



Verify Outgoing Email Settings in Central Administration:




Check out the following articles for possible configurations:

Inherited Permissions

(applies also to SharePoint Online)

The Access Request Setting is also missing when the site is inheriting permissions from its parent:



Stop inheriting permissions and the setting becomes available:





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