How to find the username of a private Telegram channel?

How To
1

I want to send a broadcast message to a Telegram channel. For testing purposes I use a private channel.
I need to set the Chat ID to the @username of the channel. Where to find that username?
According to ChatGPT it’s the private invite link, but I get a “[400] Bad Request: chat not found” error.

Anybody?

username private telegram channel
username private telegram channel432×191 8.85 KB

3

I found it already.
Posted manually a message in the channel and the Telegram Watch updates reveals the Chat ID.

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