trying to install a kernel debug rpm

i have rhel8.4 box
trying to follow this
https://access.redhat.com/solutions/5441
this command fails
# stap-prep

ends with

Could not find debuginfo package for the following installed packages: kernel-4.18.0-305.7.1.el8_4.x86_64
Could not find debugsource package for the following installed packages: kernel-4.18.0-305.7.1.el8_4.x86_64
Dependencies resolved.
Nothing to do.
Complete!
package kernel-debuginfo-4.18.0-305.7.1.el8_4.x86_64 is not installed

any hints would be great like the repo i should find it as "yum provides" gave nothing.
-Angelo