SandboxPostCopy not working for us

Here is the code I am using for the SandboxPostCopy class.

global class SandboxRefreshCutover implements SandboxPostCopy {
    global void runApexClass(SandboxContext context) {
        System.debug('Sandbox copy done. ' + context.organizationId() + ' ' + context.sandboxId() + context.sandboxName());
        //Replace the URL endpoint in a Customer Setting
        Integration_Endpoints__c integrationEndpoint = Integration_Endpoints__c.getValues('TEST');
        if(integrationEndpoint != null)
        {
            integrationEndpoint.URL__c = 'http://www.test.com';
            update integrationEndpoint;
        }
        else
        {
            integrationEndpoint = new Integration_Endpoints__c(Name = 'TEST', URL__c = 'http://www.test.com');
            insert integrationEndpoint;
        }
    }
}