Arlo pro, can't add a 4th camera

[francescoo]

I bought Arlo Pro with 4 cameras.

I correctly sync 3 cameras but I can't sync the 4th camera.

When I start the sync process the 4th camera led blink in amber; I already try to charge the battery, remove the battery but I was not able to sync this camera.

The camera is brand new and never been used.

What can I do ?

[jguerdat]

First, make sure you're only briefly pressing the base sync button - don't hold it.

Remove the battery and use only the power cord.  Try syncing- did that help?  If not, you have a bad camera.  Swap the system at the store or open a case with support using the Contact Support link at the bottom here.