If the QR code is not readable, please use the “Visit URL” link in the game to perform the linking process to PROS. 

The QR code has an expiration time, if the time expires, please, load the popup again with the instructions to link the game with PROS, and you will get a new QR code. 

Please ensure you created/logged in with a PROS account and clicked on the “Link Game” button in the last step of the linking process. 
 
If you still have the issue, please access the game and scan a new QR code to perform the PROS account linking process again.