Norton account shows computer offline when I'm really online

I have three desktop computers and one lap top.

All turned on, connected to the internet.

I logged in to my online account, go to devices to add new key., it shows all of my computers offline.

I click on each device, enter new key. Wait for it "to connect with offline devices".

Log back in the next day, 2 of the computers were updated.

I re-enter the key in computer # 3, and it just reverts to key about to expire.

Try again, same result, 5 days left on subscription.

I physically check the third computer and it shows a new key has been installed, 366 days left in subscription

This seems to be a recurring problem every year.

I purchase  Norton key cards from Amazon or Staples, as the renewal from Norton is usually 3 or 4 times the retail price every where else.

I have used Norton products for a decade, and really wonder sometime why I have stuck with them.

So, why does it takes multiple attempts to update keys through the on-line account?

Why does Norton account show my computer is off line, when I'm using that very computer to access my account?

thanks in advance for any insights.

Norm