Thank you very much, but what is my product code if I have Creative Cloud monthly subscription? I haven't received any product codes.
Welcome to Adobe Forum,
For CC, you do not have to submit the proof of eligibilty, you will be asked by Email to submit the eligibity documents.
CC is based on Email ID, serial number are not required for CC.
You can use it as you have been assigned 20 GB of space as well you have activated it once.