I have 8 echos/dots throughout my house. I can drop in from one to another fine. Broadcast fine. But when I drop in from my cell phone alexa app to any unit, it will connect (the echo dings and the green ring appears), the speaker and microphone icon show up in the phone screen, along with the hangup button. But, I cannot talk to, or hear from the dropped in echo! I have tried with the both positions of the speaker and microphone button on the phone screen to no avail. Communication is set to "household" on all units which are all my account. Any ideas? I appreciate it.