I’m using gnome DE and I’m facing a similar issue.
After enabling fingerprint from the settings when I use sudo on terminal first it requires password and after providing it asks for fingerprint.
I am not sure if this is a gnome or manjaro issue…
If anyone has found any solution please let me know.
Your post has been moved to a dedicated topic.
Please avoid posting your issue in another member’s Support topic, especially one that seems abandoned by the OP.
I understand it’s easy to make such mistakes when some other forums might allow such practice, however, the Manjaro forum does not encourage it.
A new Support topic is always recommended for each issue.
In order for others to help you as best they can, please provide a full description of your issue, including as much detail as possible.
Start with your system information as described (below). I’m sure someone will help when they are able.
Regards.
What follows is from a standard template.
Welcome to the Manjaro community
As a new or infrequent forum user, please take some time to familiarise yourself with forum requirements, and the many ways to use the forum to your benefit.
Note: By virtue of using the Manjaro forum you acknowledge and agree to follow Rules and Guidelines outlined; so, you really should read them:
Required Reading
Highly Recommended
Work with us, not against us
Be prepared to provide output from commands when asked. It is equally important to provide as much actionable information as possible in your first post, rather than simply indicating there is a problem.
Simply waiting for others to ask you questions can be counter-productive – typically, nobody has a 
at their disposal – instead, please help others to make informed suggestions based on information you provide.
System Information
While information from *-fetch type apps might be fine for someone wishing to buy your computer, for Support purposes it’s better to ask your system directly; 
Output of the inxi command (with appropriate parameters, and formatted according to forum guidelines) will generate information useful for those wishing to help:
Suggested inxi command (use either):
inxi -zv8 |
(short-form) |
inxi --filter --verbosity=8 |
(long-form) |
| inxi man pages | (manual) |
If running `inxi` within a `chroot` environment
- Add
--color=0to the long-form command, or… - Change the short-form command to
inxi -zv8c0