When trying to install the CIFS/SMB CSI Operator on a RHOCP cluster where the Nutanix CSI Operator is already in use, the following error shows up:

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Namespace does not support installation mode
The OperatorGroup in the openshift-cluster-csi-drivers Namespace does not support the global installation mode. Select a different installation Namespace that supports this mode.
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    4.20.0

    Easily reproducible on any platform.

    1. Install the Nutanix CSI Operator following the recommendation.
    2. Verify the openshift-cluster-csi-drivers OperatorGroup has successfully been created by the Nutanix Operator.      
    3. Try to install the CIFS/SMB CSI Operator on the recommended Namespace openshift-cluster-csi-drivers     

    Installation stuck with the following error:
Namespace does not support installation mode
The OperatorGroup in the openshift-cluster-csi-drivers Namespace does not support the global installation mode. Select a different installation Namespace that supports this mode.

    CIFS/SMB CSI Operator Succesfully installed on the recommended namespace.

    It is possible to install the CIFS/SM CSI Operator on a custom Namespace, but the procedure is not supported by Red Hat according to our Documentation.