Hello! Could you test version 2.9.2 from backports? Does the message appear there? For a backports guide see: https://backports.debian.org/Instructions/
If even this version is considered ancient, I could backport 3.1.1 from testing. I am sure it still is working. From what I know, versions older that 3.1.1 are unable to operate for newly registered users whose UIDs do not fit signed 32bit. However, the older versions continue to work for already existing users. As a maintainer I can only offer you to switch to backports repository. Release managers do not happy with huge updates after Debian freeze. Telegram team in their turn is primarily focused on implementing new features. The goals seem contradictory, and users stuck between a rock and a hard place.
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