Yes, troubles have lasted about four hours : http://downdetector.com/status/telegram

@flohack The other three unofficial applications are in a somewhat similar situation and yet have been included in the list by the Telegram team (as unofficial apps). They do "not give the experience of the current features", these apps "are not made by" Telegram team,... One of the three has no contribution since more than two years : https://github.com/vysheng/tg/graphs/contributors?from=2016-01-09&to=2018-03-27&type=c And yet they are listed... So it seems worth trying.

Oh... It seems I've assumed, that there was some kind of black magic switching channels for me... A compelling case of rtfm (respectively wiki) - I'm sorry... :-/

Yeah just figured it out :) Cheers man