Hi @NorfauzanNaim 

Thanks for reaching out to TP-Link Business Forums.

May I know if the Cloud LED on the OC200 light up?

If you connect a PC to the OC200's ETH port, can you access network?

You may refer to this to enable Cloud Access: How to enable Cloud Access on Omada SDN controller | Omada Network Support

  @Gabriel-TP 

Hi Gabriel,

From OC200, i able to ping 8.8.8.8 and omada.tplinkcloud.com

Hi @NorfauzanNaim 

What's the Cloud Access Status on your OC200? Does it show Connected?

As the Cloud Access is a basic option, once your OC200 can access network, you can easily bind your TP-Link ID to it. 

If the same issue occurs, could you please screenshot the error message and send it to us?

You can also try with different web browsers and change the controller DNS to 8.8.8.8 to see if that helps.