An internal error occurred while sending the form

Hello Paul,
We will help you sort it out. You have already contacted our sales support team, please contact our sales support team again with the valid activation key, they will help you to register the code to your AVG MyAccount.
Regards,
Alok.

Just bought  AVG ultimate 2018 and tried to register it on the site. Used the link in the email - https://app.avg.com/ww-en/retail - Have tried IE, Edge & Chrome all with the same error - An internal error occurred while sending the form.

Not sure what to do now as I can't proceed.  Anyone have any suggestions for me please?

Hello Paul,
We will help you sort it out. You have already contacted our sales support team, please contact our sales support team again with the valid activation key, they will help you to register the code to your AVG MyAccount.
Regards,
Alok.