I redeemed my 12 month membership (purchased from GameStop) for PS+ on one PS4. I enjoyed playing some games then we received a different one. Logged in and went to enjoy some online gaming when it informed me I did not have PS+. Has anyone else ran into this issue, or know of a way to fix it?
Received a different what? A different PS4? The Playstation Plus subscription is connected permanently to the PSN account that was signed-in when the code was redeemed. It can't be used with any other PSN account, even on the same console, except for online play. The Plus subscription will only be usable when you are signed-in to PSN with the same PSN account that you redeemed the code under.