Host registration fails with error RestlibException: HTTP error (422 - Unknown): Please unregister or remove hosts which match this host before registering

Issue

• Host registration fails with following error:

2019-03-24 09:08:17,179 [ERROR] subscription-manager:35863:MainThread @managercli.py:1122 - HTTP error (422 - Unknown): Please unregister or remove hosts which match this host before regist
ering: server.example.com
Traceback (most recent call last):
  File "/usr/lib64/python2.7/site-packages/subscription_manager/managercli.py", line 1119, in _do_command
    type=self.options.consumertype
  File "/usr/lib64/python2.7/site-packages/rhsmlib/services/register.py", line 80, in register
    type=type
  File "/usr/lib64/python2.7/site-packages/rhsm/connection.py", line 969, in registerConsumer
    return self.conn.request_post(url, params)
  File "/usr/lib64/python2.7/site-packages/rhsm/connection.py", line 696, in request_post
    return self._request("POST", method, params, headers=headers)
  File "/usr/lib64/python2.7/site-packages/rhsm/connection.py", line 719, in _request
    info=info, headers=headers)
  File "/usr/lib64/python2.7/site-packages/rhsm/connection.py", line 597, in _request
    self.validateResponse(result, request_type, handler)
  File "/usr/lib64/python2.7/site-packages/rhsm/connection.py", line 656, in validateResponse
    raise RestlibException(response['status'], error_msg, response.get('headers'))
RestlibException: HTTP error (422 - Unknown): Please unregister or remove hosts which match this host before registering: server.example.com
2019-03-24 09:10:46,579 [INFO] yum:36523:MainThread @connection.py:871 - Connection built: host=satellite.example.com port=443 handler=/rhsm auth=identity_cert ca_dir=/etc/rhsm/ca/ ins
ecure=False