We are sorry that you are having trouble purchasing hints for WordBrain 2. Please ensure that you have updated your game to the latest version.
If your issue remains, try this classic tech move; shutting it off and on again. Shut down the app and turn your WIFi/Cellular data off and on again before your launch the app again.
Also check to see if your device date and time is correct.
If this tried and tested technique doesn’t work, please send an email from the "Help Center" and we will get back in touch.