As seen in this issue, if Koji reports a tag error after the build step MBS does not update the build with that information. This should be changed for clarity.
Do we know if tagging failed during the initial checks in the tagBuild call or later in the tag task?
tagBuild
The error from koji for that case was TagError: Package perl-CGI not in list for eln-modular-updates-candidate so it's failing during the initial checks of tagBuild.
TagError: Package perl-CGI not in list for eln-modular-updates-candidate
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