Thank you for your asking. Do you mean that you can not set up the fingerprint? Does the issue appear after repaired?
If so, please check your inbox and provide me your SN, RMA, and personal information for further checking.
If not, kindly try some at-home troubleshooting tips below:
1. Delete your fingerprint and reset again
2. Check Settings>Apps & notifications>See all apps>3 dots on the top row>Reset app preferences
3. Please try to enter "Safe Mode". If the function works well in Safe Mode yet the issue remains out of Safe Mode, please check any disturbance from installed 3rd party apps.
# How to enter and exit "Safe Mode"
4. Please check on SMMI test
Calculator> type ".12345+=">SMMI TEST>Single Test>Fingerprint Test
How's the result of your SMMI test?