Please can you try doing the following in order to generate a new Hardware Key?
Please be sure to follow all of the steps as they are written, as there may be an invisible NULL character in the Hardware Key box, and the below instructions will ensure that this gets removed.
On the Advanced Tab of the Player Options, click inside the Hardware Key box
Press CTRL + A on your keyboard to select everything in the Hardware Key box, then press the delete key on your Keyboard
Click on the Connect button, then click on Exit
Re-open the Player Options and click on Connect again.