Is this 72 hour activation just a for one-time use?

I was able to copy this activation key, which is valid for 72 hours, and paste it into the Manual Product Activation window to use it.

The first time, I was able to use it for 72 hours without any problems.

After 72 hours have passed, I want to use it again, so I do the same thing, but this time a window appears saying that is incorrect and I can't use it.

No matter how many new activation keys I receive, each key is always incorrect and a window appears with the message "the key is not correct".

Question:

Is this 72 hour activation only once per account?

↓↓↓Confirmed↓↓↓

"I create a new account, and i get another 72 hours for activation.

But it seems so ridiculous to create a new account for every 72 hours activation..."