There is no biometric authentication plugin in the Plugins directory so you would have to develop the plugin either yourself or get a developer to do it for you. If you are a web developer already, you can learn how. Apart from the development pages here on moodle.org, there are a couple of development books – see https://moodle.org/books including my book ‘Introduction to Moodle 3.9+ Plugin Development‘ (https://books2read.com/m39plugindevelopment) and a number of courses -Moodle Plugin Development Basics (https://moodle.com/news/learn-moodle-plugin-development/) (free), the MoodleBites for Developers Level 1 – expensive – (https://www.moodlebites.com/mod/page/view.php?id=24546) and a few short specific ones on Udemy (https://www.udemy.com/courses/search/?src=ukw&q=moodle+development).
General developer forum
Biometric authentication fingerprint login in moodle
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