Updating or installing Dell’s srvadmin package and you got this:

warning: /var/cache/yum/x86_64/7/dell-system-update_dependent/packages/srvadmin-omilcore-9.1.0-3013.13047.el7.x86_64.rpm: Header V4 RSA/SHA512 Signature, key ID 34d8786f: NOKEY
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-Dell-DSU

The GPG keys listed for the "dell-system-update_dependent" repository are already installed but they are not correct for this package.
Check that the correct key URLs are configured for this repository.

Failing package is: srvadmin-omilcore-9.1.0-3013.13047.el7.x86_64
GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-Dell-DSU

Fix

rpm --import http://linux.dell.com/repo/pgp_pubkeys/0x1285491434D8786F.asc
yum update srvadmin*

Ref: https://www.dell.com/community/Systems-Management-General/srvadmin-omilcore-package-signature-verification-failure/td-p/6100045