Auto registration only does something the first time a new device attempts to register.
Check your current MAC address from the Preferences/Network screen in CIPC; typically it's best to assign custom device names rather than use MAC addresses, as MAC addresses are more prone to errors and changes. You might assign (for example) your AD username or some other known ID.
Make sure you add either the current CIPC generated device name, or the custom one you specify to CCM.
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"the Cisco CTL Provider service changes the security mode from nonsecure to mixed mode and transports the server certificates to the CTL file. The service then transports the CTL file to all Cisco Unified Communications Manager and Cisco TFTP servers."
You need this service to be running. It is the one that handles the CTL transporting
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.