Foreman: 1.22.0
Katello: 3.12.0

While I've been working towards migrating from Spacewalk/RHSat5, I've been rebuilding hosts left & right.  I've been making changes to the host records in TFM/Katello, triggering a host build, downloading a boot ISO, and rebuilding in place.  The redhat-register provisioning template has been able to re-register and connect the host record.

Now, I'm finding that this registration is failing.  Adding a --force option doesn't seem to make a difference:

root@<host> ~]# subscription-manager register --force --name="<FQhostname>" --org='Organization' --activationkey='dev-centos7,dev-mondorescue-el7'
HTTP error (422 - Unknown): Please unregister or remove hosts which match this host before registering: <FQhostname>
[root@<hostname> ~]# subscription-manager unregister
This system is currently not registered.
[root@<hostname> ~]# subscription-manager register --force --name="<FQhostname>" --org='Land_O_Lakes' --activationkey='dev-centos7,dev-mondorescue-el7'
HTTP error (422 - Unknown): Please unregister or remove hosts which match this host before registering: <FQhostname>

jturel suggested running "hammer host subscription unregister host <FQhostname>" on the TFM/Katello host prior to the rebuild.  This work-around now lets me successfully register the host in place.

What other data or logs can I supply?  /var/log/rhsm/* doesn't seem to supply much detail beyond the above.