Unable to join AD: Couldn't join realm: A domain with this name is already configured

Solution Unverified - Updated -

Issue

  • While trying to join AD domain, the following error message is showing:

    [root@server ~]# realm join example.com -U administrator
    realm: Couldn't join realm: A domain with this name is already configured
    

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8

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