You could try this:
- Turn off the device by holding power button down for 6-10 seconds
- Tap the power button to turn it back on.
- Once the surface logo appears, wait for circling dots to appear and then hold power button down for 6-10 seconds to turn device off again.
- Repeat steps 2 & 3 until the surface logo appears with words underneath saying “Preparing Automatic Repair”
- Recovery mode will start.
- At the Bitlocker screen, tap “skip this drive”
- Tap advanced options
- Tap Troubleshoot
- Tap Refresh
Refresh will take 10 to 25 minutes, when it's done the Surface should go to the login screen. If this doesn't work, try again but select Reset instead of Refresh. I hope it works for you!