Difficulties for activation

Hi, I cannot activate my 
AVG Internet Security for Windows.
When I enter the activation code, I get a message that I must connect to the internet, but I am connected.

Hello Claudia.
We are sorry for the inconvenience. 
To troubleshoot and resolve this issue, we'd like to offer you a free remote assistance service.
I have sent an email containing steps to get connected with our remote assistance team. Check your inbox and spam box as well.