I am also absolutely annoyed that this appears not to be possible, and am seriously thinking of returning my hello for this reason alone. It's appalling they would release a doorbell and not offer this feature or a simple chime to go with the doorbell. WTF.
Sorry for the late response, but I wanted to drop in here to help.
I understand that this can be frustrating but I definitely wanted to stop by and see how I could help.
Just wanted to double check to see if you were still needing help on this? If so, what troubleshooting steps have you tried?
I look forward to hearing from you.