Glad to hear that Alma worked out for you!
For Alma Rocky, the first step should be to map out the content. Which repository (or repositories?) is the erratum in? Which repository (repositories?) are related packages in?
I found my old old thread about past Rocky troubles. I wonder if the problem is similar. Installable errata suddenly shows up in hosts content view, but not installable via content view - #14 by iballou