Sorry to hear about that @Stovebolt! To start, if you are able to live view your home Stick Up Cams from the vacation location, this will rule out cellular coverage. Keep in mind, when setting up new devices, there can often be an update before it is fully ready to use.
The next things I recommend checking are the device RSSI and the wifi speeds at the location to ensure they are sufficient to operate both Cams the same as your home. Let us know how this goes! 