dnf -y copr enable dcantrell/rpminspect 

non-zero return code

Enabling a Copr repository. Please note that this repository is not part
of the main distribution, and quality may vary.

The Fedora Project does not exercise any power over the contents of
this repository beyond the rules outlined in the Copr FAQ at
<https://docs.pagure.org/copr.copr/user_documentation.html#what-i-can-build-in-copr>,
and packages are not held to any quality or security level.

Please do not file bug reports about these packages in Fedora
Bugzilla. In case of problems, contact the owner of this repository.
Error: It wasn't possible to enable this project.
Repository 'fedora-37-x86_64' does not exist in project 'dcantrell/rpminspect'.
Available repositories: 'fedora-40-aarch64', 'fedora-40-ppc64le', 'epel-9-aarch64', 'epel-9-s390x', 'fedora-rawhide-aarch64', 'fedora-38-x86_64', 'fedora-39-s390x', 'fedora-38-s390x', 'fedora-rawhide-s390x', 'epel-7-ppc64le', 'fedora-38-ppc64le', 'fedora-40-x86_64', 'epel-9-x86_64', 'fedora-39-x86_64', 'fedora-39-aarch64', 'epel-8-s390x', 'fedora-38-aarch64', 'epel-7-x86_64', 'epel-8-x86_64', 'fedora-39-ppc64le', 'fedora-40-s390x', 'fedora-rawhide-ppc64le', 'fedora-rawhide-x86_64', 'epel-8-ppc64le'

If you want to enable a non-default repository, use the following command:
  'dnf copr enable dcantrell/rpminspect <repository>'
But note that the installed repo file will likely need a manual modification.