You can try the following:
- Completely shut down your phone or tablet.
- Restart your phone or tablet.
- Update Google Play/iOS if asked.
- Relaunch the TurboTax mobile app and try it again.
If doing the above does not help, you will need to enter in your w2 manually.
If you need further assistance, use the following link to contact customer support.
https://support.turbotax.intuit.com/contact/