Can't activate AVG by entering the license number

Hi Deondee,

We have sent an email and requested you to mention the license number.
Please revert to our email without changing its subject.
Thank you.

why i cannot activate my product by entering the following license number?

Hi Deondee,

We have sent an email and requested you to mention the license number.
Please revert to our email without changing its subject.
Thank you.