Welcome to the Affinity forum @mamalady,
I am sorry to hear that you are having issues with the codes you have received. Are you entering the entire code into the relevant section?
The most common reason this happens is that recipients ignore the word at the beginning of the code and only enter "code" looking part. You need to ensure that you are entering the enter code, including the word at the beginning.
If this still does not work, contact affinity@serif.com with the code itself and we can look in to this further for you.
mamalady got a reaction from StevenS in Error: The code you entered does not exist.