Hello @Albert_Ong and welcome to the community!
So we can better assist you, please provide a brief description of your current setup using this link as a guide.
Make sure to describe your network configuration/topology, including any networking hardware currently in use, so we can have a clear understanding of how your devices are communicating.
Also, we have noticed this issue occurring when there’s something on the core or network blocking the connection to our servers. Such as a firewall, AV, or VPN. Do you have anything like that set up?