I owner of few telegram groups, but I can't promote admin in my own groups anymore. Every time I see messages: "Sorry, you are not allowed to do this" (mobile app) or "Could not add user. Please try again later." (desktop version) Steps to reproduce Mobile version: Go to own public group Tap on group icon and scroll to member list Long tap on any user Select "Promote to admin" Tap on checkmark on top Desktop version: Go to own public group Click on title with group name and scroll to member list Right click on any user Select "Promote to admin" Click save Device info Telegram Desktop 2.7.1, PC 64bit, Linux awesome X11 glibc 2.33

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