Leapp upgrade fails with custom repository and reports error 'Cannot find required basic RHEL target repositories.'

Issue

• The following error occurs during the leapp preupgrade --enablerepo Custom_Repo_ID1 --enablerepo Custom_Repo_ID2 process.

====> * target_userspace_crypto_policies
        Set crypto policies inside the target userspace container.
2025-06-27 04:16:40.184 ERROR    PID: 60438 leapp.workflow.TargetTransactionCheck.target_userspace_crypto_policies: Missing the TargetUserSpaceInfo message. Probably it has not been created before.
====> * adjust_local_repos
        Adjust local repositories to the target user-space container.
2025-06-27 04:16:40.255 ERROR    PID: 60487 leapp.workflow.TargetTransactionCheck.adjust_local_repos: Missing required information to proceed!

• The /var/log/leapp/leapp-report.txt reports the following error.

# /var/log/leapp/leapp-report.txt
Risk Factor: high (inhibitor)
Title: Cannot find required basic RHEL target repositories.
Summary: This can happen when a repository ID was entered incorrectly either while using the --enablerepo option of leapp or in a third party actor that produces a CustomTargetRepositoryMessage.
Related links:
    - RHEL 7 to RHEL 8 LEAPP Upgrade Failing When Using Red Hat Satellite: https://access.redhat.com/solutions/5392811
    - Preparing for the upgrade: https://red.ht/preparing-for-upgrade-to-rhel9
Remediation: [hint] It is required to have RHEL repositories on the system provided by the subscription-manager unless the --no-rhsm option is specified. You might be missing a valid SKU for the target system or have a failed network connection. Check whether your system is attached to a valid SKU that is providing RHEL 9 repositories. If you are using Red Hat Satellite, read the upgrade documentation to set up Satellite and the system properly.