When I restart and activate the Vivint / Vivotek doorbell it still doesn’t show up. Is this item not compatible or am I doing something wrong?
Peripheral devices which do not use Z-wave would be incompatible as they are proprietary unfortunately. You cannot use that Doorbell cam with Alarm.com.
The Skybell HD and ADC Skybell Slimline are compatible models with Alarm.com.
In addition, the other vivint sensors aren’t responding. Ex: V-PIR2-345 isn’t being seen by the system, even though the item seems to turn on when i hit the test button, even though the 2GIG-PIR2-345 is listed as compatible with the GC3.
This will depend on the sensor. The “XXX2-345” are different models than the standard 2GIG 345 Mhz sensors. That model is not officially compatible with the GC3, it is as far as I know only used with the Sky Panel new. We’ve heard reports of users having some success with them though. Here is a link to discussion about the GB2 glassbreak. The user indicates he had to type in the id manually.