Renewal
Add time to your Strong 8K line
A renewal edits one field on the line you already hold - the date it stops. Everything a device was configured with survives untouched: the same server address, the same username, the same password, the same playlist link saved in whichever app you set up last. There is nothing to reinstall, nothing to retype and no second line created alongside the first.
The email address is the join. Type the one that is on the original S8KM- order, character for character, because that is how the panel finds the line to extend. A different address is not an error it can detect - it simply builds a second, unrelated subscription and charges you for it. Pay a few days before the expiry date as well: adding time to a line that is still answering happens at once, while waking a lapsed one occasionally waits on somebody at this end.
Credentials unchanged Nothing to retype Days added to the ones left
Forgotten which address the first S8KM- order went to? Message support and it gets traced at this end. If it seems odd that no screen in the house needs opening afterwards, what a line actually consists of explains why.