Katello 3.18.1 Content Migration to Pulp 3 fails with "No declared artifact" message

Hi @fbachmann,

Can I see your Pulp 3 versions?

sudo pip3 list | grep pulp

I found a potentially-related Pulp 3 issue: Issue #7489: "No declared artifact with relative path" when migrating from Pulp 2 to Pulp 3 - Migration Plugin - Pulp