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Why do Container Registry commands fail saying they're not registered?

Why do Container Registry commands fail saying they're not registered?

You can't run any IBM Cloud® Container Registry ibmcloud cr commands. The commands are failing with the message: 'cr' is not a registered command. See 'ibmcloud help'.

You're trying to run an ibmcloud cr command, but you receive an error message similar to one of the following error messages:

ibmcloud cr login
'cr' is not a registered command. See 'ibmcloud help'.

ibmcloud cr namespace
'cr' is not a registered command. See 'ibmcloud help'.

The container-registry CLI plug-in is not installed.

Install the container-registry CLI plug-in, see Installing the container-registry CLI plug-in.