The seat has not been assigned to anyone. Sign into the account management page:
https://ecom-prd.trimblepaas.com/ecom/portal#/subscription
Choose the account that is your name, not the one that looks like your email address. Go to the Members section, and select SketchUp Pro. Look for a +Assign button, and add yourself as the user of the subscription.
Then it will show you as active instead of trial. You may need to close and reopen SketchUp for the change to show up. Or sign out and in again.