@bikashsah I suggest that you start by restarting your phone. Next, you want to check if your phone's software is outdated. Go to "Settings" > "Software update" and check for any available updates. Then you have to consider that Xiaomi may have turned the fingerprint sensor software off. Xiaomi has had a lot of bugs with their fingerprint sensor and software. Of course, then there is also the possibility of this being a hardware issue. If your sensor has failed, your software will most likely not find it.
Since iFixit does not yet have a guide for this, use something like [link|https://www.nadiemellamagallina.com/en/manuales/smartphones-1/xiaomi-191/xiaomi-redmi-note-10-pro-1292/lector-de-huellas-11534|this guide] to replace it. A new sensor flex is readily available at many online stores. Use a vendor that appeals to you.
While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.