If your Telegram bot goes silent after a user sends /start, the pairing probably wasn't approved. Check your approval queue first.
There's a nastier bug you should know about. Telegram returns negative chat IDs for groups (like -1001234567890). OpenClaw's AccountId normalizer strips the minus sign, so replies silently drop. Your messages go nowhere with no error. Run openclaw status --deep to probe your channel connections.
Discord has its own issue. Your bot shows online but never replies. The fix is almost always the same: enable "Message Content Intent" in the Discord Developer Portal under Bot settings. Also confirm your bot has "Read Messages" and "Send Messages" permissions in the channel.