License number not working

Hello Yvonne. 
Thank you for contacting AVG Community Support.
We apologize for the inconvenience caused to you.
We certainly check and help you.
Please help us with a screenshot of the error to check and help you further.
Here is the link which has the steps to take a screenshot :
| AVG (https://support.avg.com/SupportArticleView?l=en&urlName=AVG-Create-screenshot&q=How+to+create+a+screenshot&supportType=home)
Thank you.

Hello Yvonne. 
Thank you for contacting AVG Community Support.
We apologize for the inconvenience caused to you.
We certainly check and help you.
Please help us with a screenshot of the error to check and help you further.
Here is the link which has the steps to take a screenshot :
| AVG (https://support.avg.com/SupportArticleView?l=en&urlName=AVG-Create-screenshot&q=How+to+create+a+screenshot&supportType=home)
Thank you.

I have tried to add the avg internet security to my sons computer with the license number provided by my the email I was given with automatic renewal but it says the license is not valid??