ERROR: HTTP error (422 — Unknown): Validation failed: Name has already been taken

If you encounter this message while registering a host then follow below troubleshooting steps:

STEP1:

subscription-manager remove — all
subscription-manager unregister
subscription-manager clean

Still not able to resolve the issue, follow next step

STEP2:

Go to the Satellite portal and delete the hosts. Do hammer list:

hammer host list | grep 'host.eample.com'
hammer host delete --id <host_id> --organization <org_name>

If still not working, perform the below steps.

STEP3:

su - postgres -c 'psql foreman -c "select id,name,type from hosts where name = '\''host.example.com'\'';"'
foreman-rake console
> h = Host.find_by_id(I)
> h.disassociate!
> HostStatus::Status.where(host_id: I).delete_all
> h.subscription_facet.destroy
> h.content_facet.destroy
> h.destroy
> Host.find_by_id(I)
> exit

Now try to register your host.