UTM 9.3 Dynamic DNS Service - Need Help with Configurations and Any Caveats

I am attempting unsuccessfully to configure Dynamic DNS. So far, I have configured the following.

1. Changed nameserver IP at my domain registrar to point to one of the DDNS providers listed in the UTM DDNS drop-down.

2. Selected NmChp in drop-down list.

2. Provided @ as username. I read this would work somewhere. Other possible usernames (listed on NmChp or left blank did not work.

3. Entered the extreamly long auto-generated password provided by NmChp.

4. Status is always "the Last Update Failed

Any help would be appreciated....If NmChp is not working with UTM is there another that is proven to work?

Thanks,