I often face this issue. The fingeprint sensor does not work and sometimes the touch also misbehaves when phone is charging.
Why does this happen and how to fix this?
I experienced this issue with Mi Note 4, as well as Redmi 4A.
Why does fingerprint sensor not work when phone is charging?
Question
Answer
As requested by OP posting answer, in response to my comment (now deleted) based on my experience
Having a clean power supply, using original charger + USB cable, setting up finger prints again are the common things that work...
I am not sure as to why touch sensor works only with original charger but posting as it may help, as it helped OP
Q & A
Can't install Lineage OS due to outdated bootloader on Moto G 2013 XT1034 falcon
Is a ROMs data (/data) from Nougat compatible with MM?
How to force dark mode on Firefox for Android?
Where are APN configs saved in Android?
LineageOs compatible with European (H850) version of LG5
"Ok Google" voice unlock stopped working on Google Nexus - "Actually I can't do that while the device is locked"
Root with Kingo root; stuck at turn on screen
Issues with SD Card "Reinsert SD Card" for Internal Storage (Adoptable Storage) Android 6.0 (Marshmallow)
Use Automation App to Detect if Keyboard is Active
Android 4 slows down over year without reason
Installing Purchased App On New Device? [PlayStore ISSUE]
Can I do a factory reset without losing my pictures and apps?
Does downloading too many games slow down a device?
Can I safely delete .facebook_cache folder if I don't have a Facebook app installed?
How to use SP Flash Tool to install a new Recovery?
ADB/fastboot stopped working in recovery mode
What is the minimum MicroSD speed necessary to extend the storage of an Android phone?
Tethered VPN Connection
How to use Microsoft Exchange ActiveSync to sync Hotmail and Outlook contacts to Android?
Why can't this application be deactivated after screen is locked?
Is a ROMs data (/data) from Nougat compatible with MM?
How to force dark mode on Firefox for Android?
Where are APN configs saved in Android?
LineageOs compatible with European (H850) version of LG5
"Ok Google" voice unlock stopped working on Google Nexus - "Actually I can't do that while the device is locked"
Root with Kingo root; stuck at turn on screen
Issues with SD Card "Reinsert SD Card" for Internal Storage (Adoptable Storage) Android 6.0 (Marshmallow)
Use Automation App to Detect if Keyboard is Active
Android 4 slows down over year without reason
Installing Purchased App On New Device? [PlayStore ISSUE]
Can I do a factory reset without losing my pictures and apps?
Does downloading too many games slow down a device?
Can I safely delete .facebook_cache folder if I don't have a Facebook app installed?
How to use SP Flash Tool to install a new Recovery?
ADB/fastboot stopped working in recovery mode
What is the minimum MicroSD speed necessary to extend the storage of an Android phone?
Tethered VPN Connection
How to use Microsoft Exchange ActiveSync to sync Hotmail and Outlook contacts to Android?
Why can't this application be deactivated after screen is locked?
Topics
2D Engines 3D Engines 9-Patch Action Bars Activities ADB Advertisements Analytics Animations ANR AOP API APK APT Architecture Audio Autocomplete Background Processing Backward Compatibility Badges Bar Codes Benchmarking Bitmaps Bluetooth Blur Effects Bread Crumbs BRMS Browser Extensions Build Systems Bundles Buttons Caching Camera Canvas Cards Carousels Changelog Checkboxes Cloud Storages Color Analysis Color Pickers Colors Comet/Push Compass Sensors Conferences Content Providers Continuous Integration Crash Reports Credit Cards Credits CSV Curl/Flip Data Binding Data Generators Data Structures Database Database Browsers Date & Debugging Decompilers Deep Links Dependency Injections Design Design Patterns Dex Dialogs Distributed Computing Distribution Platforms Download Managers Drawables Emoji Emulators EPUB Equalizers & Event Buses Exception Handling Face Recognition Feedback & File System File/Directory Fingerprint Floating Action Fonts Forms Fragments FRP FSM Functional Programming Gamepads Games Geocaching Gestures GIF Glow Pad Gradle Plugins Graphics Grid Views Highlighting HTML HTTP Mocking Icons IDE IDE Plugins Image Croppers Image Loaders Image Pickers Image Processing Image Views Instrumentation Intents Job Schedulers JSON Keyboard Kotlin Layouts Library Demos List View List Views Localization Location Lock Patterns Logcat Logging Mails Maps Markdown Mathematics Maven Plugins MBaaS Media Menus Messaging MIME Mobile Web Native Image Navigation NDK Networking NFC NoSQL Number Pickers OAuth Object Mocking OCR Engines OpenGL ORM Other Pickers Parallax List Parcelables Particle Systems Password Inputs PDF Permissions Physics Engines Platforms Plugin Frameworks Preferences Progress Indicators ProGuard Properties Protocol Buffer Pull To Purchases Push/Pull QR Codes Quick Return Radio Buttons Range Bars Ratings Recycler Views Resources REST Ripple Effects RSS Screenshots Scripting Scroll Views SDK Search Inputs Security Sensors Services Showcase Views Signatures Sliding Panels Snackbars SOAP Social Networks Spannable Spinners Splash Screens SSH Static Analysis Status Bars Styling SVG System Tags Task Managers TDD & Template Engines Testing Testing Tools Text Formatting Text Views Text Watchers Text-to Toasts Toolkits For Tools Tooltips Trainings TV Twitter Updaters USB User Stories Utils Validation Video View Adapters View Pagers Views Watch Face Wearable Data Wearables Weather Web Tools Web Views WebRTC WebSockets Wheel Widgets Wi-Fi Widgets Windows Wizards XML XMPP YAML ZIP Codes