Starting 0.28.0.1762 version, it is possible to set up face recognition, iris and other non-fingerprint biometric lock for Telegram X or specific secret chats on devices that have corresponding Class 3 classified sensors (strong security).

Note: Class 2 (weak security) sensors aren't available if your device has at least one Class 3 sensor (which usually is only the fingerprint sensor for most devices).

0.28.0.1762, with few minor changes, is about to be rolled out to all users on Google Play.

If there are any annoying specific bugs that are still not fixed for you in 0.28.0.1762 — feel free to duplicate a link to your @tgandroidtests report in the comments under this post.

0.28.0.1764 beta released.

Changes from 1762: d865380f...65853de4

0.28.1.1766 beta released.

Changes from 1764: 65853de4...123366b6

Google Play beta will be available after passing the review process.
You can install APKs without waiting: arm64, arm32, x64, x86.

Finished in 41 minutes 24.7 seconds

0.28.1.1767 beta released.

Changes from 1766: 123366b6...45e754e6

Google Play beta will be available after passing the review process.
You can install APKs without waiting: arm64, arm32, x64, x86.

Finished in 39 minutes 48.9 seconds

0.28.1.1768 beta released.

Changes from 1767: 45e754e6...e8e5b302

Google Play beta will be available after passing the review process.
You can install APKs without waiting: arm64, arm32, x64, x86.

Finished in 39 minutes 24.0 seconds