1) Goto Settings
![Image](http://southhawkct.com/images/dtv/dtvn1.jpg)
2) Goto Applications > Manage Installed Applications
![Image](http://southhawkct.com/images/dtv/dtvn2.jpg)
3) Select Directv Now. Then select "Clear Data" and select "Clear Cache"
![Image](http://southhawkct.com/images/dtv/dtvn3.jpg)
4) Reboot the firestick by going to Settings > Device > Restart
BE CAREFUL and DO NOT select "Reset to Factory defaults"
5) Once rebooted relaunch your directv now app, sign in. And that worked for me.