I have my nest hello set to spooky sounds for Halloween but when someone rings the door bell no spooky sounds happen!?! It is extremely frustrating. I have messed around with trying to get it to work multiple times with no luck!
"When you turn on a seasonal theme, a unique sound greets visitors when they ring the doorbell. If you use visitor announcements for your Google Nest or Home speaker or display , the sound plays on the doorbell and in your home."
