Avamar: Unable to edit DD in the AUI if the 'Use certificate authentication for REST communication' is selected

While attempting to "Validate" when editing a Data Domain within the Avamar Web User Interface (AUI), the following error occurs:

Failed to get Data Domain system information.
Please check DDBoost credential is correct and Avamar generated public key is imported to DataDomain system if needed.

For example:

This occurs if Avamar Security Session is disabled and the checkbox next to "Use certificate authentication for REST communication" (shown below) is selected:

This feature is only supported when Avamar Session Security features are enabled.

If Avamar Session Security is disabled, the error is received.

1.Verify the current Session Security Session settings:

a. Log in to the Avamar Utility Node as admin.

b. Elevate to root privilege.

c. Run the following command:

enable_secure_config.sh --showconfig 

If Session Security is disabled, the output is similar to the following:

Current Session Security Settings
----------------------------------
"encrypt_server_authenticate"                           ="false"
"secure_agent_feature_on"                               ="false"
"session_ticket_feature_on"                             ="false"
"secure_agents_mode"                                    ="unsecure_only"
"secure_st_mode"                                        ="unsecure_only"
"secure_dd_feature_on"                                  ="false"
"verifypeer"                                            ="no"

Client and Server Communication set to Default (Workflow Re-Run) mode with No Authentication.
Client Agent and Management Server Communication set to unsecure_only mode.
Secure Data Domain Feature is Disabled.

If Session Security is enabled, the output is similar to the following:

Current Session Security Settings
----------------------------------
"encrypt_server_authenticate"                           ="true"
"secure_agent_feature_on"                               ="true"
"session_ticket_feature_on"                             ="true"
"secure_agents_mode"                                    ="mixed"
"secure_st_mode"                                        ="mixed"
"secure_dd_feature_on"                                  ="true"
"verifypeer"                                            ="no"

2. If Session Security is disabled, clear the 'Use certificate authentication for REST communication' checkbox in the AUI and retry the required activity.

If Session Security is already enabled, the error should not be received.