Telegram what goes in allowFrom

channels.telegram.allowFrom is the human sender’s Telegram user ID (numeric, recommended) or @username. It is not the bot username.
Safer (no third-party bot):
DM your bot, then run openclaw logs --follow and read from.id.
Official Bot API:
DM your bot, then call https://api.telegram.org/bot<bot_token>/getUpdates and read message.from.id.
Third-party (less private):
DM @userinfobot or @getidsbot.
See /channels/telegram.