Not receiving Nest Camera notifications or thumbnail live stream
Hi! I haven't been able to fenagle my settings to get notifications when my doorbell rings or when my camera notices a person/package. I've looked at some other threads and it doesn't seem like you need an Aware subscription... Also, the camera thumbnails in the homekit app never provide livestreams- they're always thumbnails from hours ago. Honestly, this could all be user error, but I've searched everywhere for a solution. I noticed that my Nest Hello is not saved as a doorbell in the HomeKit app, but just as a camera. Not sure if that's part of the issue. 

I just updated everything last night and there really isn't s debug log output because technically nothing is failing... but I know it's supposed to work- just can't tell what's wrong. 

Please answer these questions before submitting this issue:
```
On what device are you running homebridge: raspberry pi 4
On what iOS version are you having issues: 14.0.1
What camera types are having issues: Nest Hello and Nest Cam Outdoor
Does this issue occur consistently or randomly: Consistently
If applicable, what was the last version that worked properly: never...
```
