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Upstream has a nice troubleshooting page: https://fedorahosted.org/sssd/wiki/HOWTO_Troubleshoot_SUDO We could use it to improve the "Using sudo" chapter.
It actually seems this might fit better in the System-Level Authentication Guide.
The changes have already been published and are available on the Customer Portal: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/System-Level_Authentication_Guide/trouble.html