I am sure that I have an Account record that the name is 'Acme', but the follow statements cannot fetch the record. 

The records.size() is 0. What is wrong?

    public static void testSOSL () {
        List<List<sObject>> results = [FIND 'Acme' IN NAME FIELDS RETURNING Account (id, name), Contact, Lead];
        
        sObject[] records = ((List<sObject>)results[0]);

        System.debug('\n\n\n' + records.size() + '\n\n\n');   
    }

Environment: Sandbox full

I am sure that I have an Account record that the name is 'Acme', but the follow statements cannot fetch the record. 

The records.size() is 0. What is wrong?

    public static void testSOSL () {
        List<List<sObject>> results = [FIND 'Acme' IN NAME FIELDS RETURNING Account (id, name), Contact, Lead];
        
        sObject[] records = ((List<sObject>)results[0]);

        System.debug('\n\n\n' + records.size() + '\n\n\n');   
    }

Environment: Sandbox full