I have added a new 1 y 3 dev linence key purchased from internet store, but it did not added time period to the existing subscription, how to fix this?

Users may contact Norton support → request new Key term added to current remaining days.

Note: new Key starts new subscription term

~ this process [here] works for me to reach: Live Agent
Norton support via Social Support | Chat | Phone [here]

Norton Community is primarily user-to-user “working” product help.
Norton Community does not have access to your Norton account, subscription nor payment profile.