Here is my experience with telegram notifications.
I have two Dude servers, hex (mmimps) and CCR1009-8g-1S-1S+ (tile) both on 6.44.2
I can get the telegram bot to work perfect on the hex except if I enter the command via CLI Terminal. I get
failure: closing connection: <404 Not Found> 22.214.171.124:443 (4)
But I setup a notification and the test button and real world alerts works.
The second dude server on the CCR should be identical the setup as the hex but I get this message if I type the same command via CLI Terminal
failure: ssl connection error: internal error (6)
But I setup the notification tool identical to the hex and the test button or the real alerts don't work.
From both routers I can ping external IP's and DNS names no problem so I'm not totally sure what could cause a ssl connection error.