Summary

Customer with Admin access is unable to see the option 'Authentication methods' under System >> Security

Environment

Jira server/DC versions above 7.13.0
.

Diagnosis

Go to System >> Security and you might not find the 'Authentication methods' option. This option would be required to add a new authentication configuration or to disable/enable the basic authentication for API calls in Jira.

Cause

The 'atlassian-authentication-plugin' is either disabled or uninstalled from the instance. 
Confirm this by checking the pluginstate table by using the below command - 

select * from pluginstate where pluginkey = 'com.atlassian.plugins.authentication.atlassian-authentication-plugin';

Cause 1 : The plugin is uninstalled from the instance. In this case, the above query will not return any results.

Cause 2 : The plugin is disabled in the instance. In this case, the above query will return pluginenabled value as false.

Solution

Solution for cause 1 : Go to Jira administration >> Manage apps >> Find new apps and install the 'SSO for Datacenter' by Atlassian

Solution for cause 2 : Go to Jira administration >> Manage apps >> search for the 'SSO for Datacenter' by Atlassian and enable it