What do you mean by "not working"?
How are you invoking these options?
If you have the following task in your Tasker, invoke it from inside Tasker, .... what does it do>
Dev9+ (559)
A1: Get Voice [ Title:Speak Language Model:Free Form Language: Maximum Results:16 Timeout (Seconds):16 ]
A2: Flash [ Text:%VOICE Long:On ]
... Thom