All the cameras are on the same Wifi and only one it is OK. Please let me know what are the next steps to investigate this?

@Soll I have attached 4 picture: GMS_Cam1 - It is OK working locally and remotely, GMS_Cam2 - It is NOT OK, can be controlled only locally. Both cameras are side by side and are connected to the same...

Can you help me to add all other MAC addres?

@Solla-topee I have sent you the MAC address. DO I need to do this for all of my cameras? I have 4 of them.

@astph No, I'm not using any VPN.

Brand new out of the box camera can only be controlled only localy. I have another two of them that are not connected yet. I have tried all the steps including changing the DNS and with other WiFi...