Question Client can't access Additional nginx directives dialogue

[blackcats]

Hello,

I've been trying to configure Plesk Service Plans to give customers access to Web Server Settings > Additional nginx directives dialogue but all they see is what is in the attached screenshot.
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Customers can enable Process PHP by nginx but they can't see the Additional nginx directives dialogue per the attached screenshot.

In my service plan, I've enabled Hosting performance settings management which is the only option I can see which might give them access to Additional nginx directives but that doesn't work.
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Is there a way to give customers access to Additional nginx directives AND Additional directives for HTTP?

I'm running Plesk 12 on Centos 6.

Thanks in advance,
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[IgorG]

Go to Tools&Settings -> Services Management and make sure that nginx service is started.