Wallet and Store PIN not working

[pma]

Since installing WP 8.1 developer preview the wallet and store PIN won't work. Affects other apps such as Groupon.
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[hopmedic]

Unfortunately, if you can't get in with the PIN, the only solution is a factory reset. Make sure you back up images to OneDrive first, and any music that you might otherwise lose. Go into the settings and do a backup of your apps, and then go to settings | about | reset my phone | yes | yes.