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Description of problem:
As of writing, epel-release-8-8.el8.noarch is currently in both, epel and epel-testing, due to recent stable push (and not all mirrors being up-to-date yet).

$ dnf download --releasever=8 --resolve --alldeps --enablerepo=epel --enablerepo=epel-testing --destdir=/tmp/epel8 --arch=x86_64,noarch epel-release
Last metadata expiration check: 0:17:12 ago on Sun Jan  5 12:40:05 2020.
Error in resolve of packages:
    epel-release-8-8.el8.noarch
    epel-release-8-8.el8.noarch

 Problem: cannot install both epel-release-8-8.el8.noarch and epel-release-8-8.el8.noarch
  - conflicting requests
$ 

Removal of '--enablerepo=epel-testing' works around this issue.

Version-Release number of selected component (if applicable):
yum-4.0.9.2-5.el8.noarch

How reproducible:
Always, see above.

Actual results:
dnf treats identical package in two repositories (testing/stable) as conflicting request.

Expected results:
dnf not treat identical packages in two repositories (testing/stable) as conflicting request.

I create a path (https://github.com/rpm-software-management/dnf-plugins-core/pull/382) that allows multiple packages with same NEVRA for download --resolve command.

CI-tests: https://github.com/rpm-software-management/ci-dnf-stack/pull/767

Jaroslav, will RHEL 8.2 contain a fixed dnf/yum package? And if so, in which version?

It will not, its set for RHEL 8.3.
Once there is a specific version the "Fixed In Version" field of this bz will be filled with appropriate nevra.

Thank you for patience.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (yum bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2020:4510