Channels "not currently available" on Team plan despite admin enablement (v2.1.81)

Description

Channels feature returns "Channels are not currently available" on a Team plan despite the admin toggle being enabled in claude.ai → Admin Settings → Claude Code → Channels.

Environment

• Claude Code: v2.1.81
• Plan: Claude Team
• OS: macOS (Apple Silicon)
• Runtime: Bun installed, plugin installs and configures correctly

Steps to Reproduce

1. Admin enables "Allow channel notifications" in claude.ai → Admin Settings → Claude Code → Channels (toggle is ON, confirmed via screenshot)
2. Install plugin: /plugin install telegram@claude-plugins-official
3. Configure: /telegram:configure <token>
4. Launch: claude --channels plugin:telegram@claude-plugins-official

Expected Behavior

Session starts with channel listener active.

Actual Behavior

• Without --debug: Shows "Listening for channel messages" but messages never arrive (typing indicator fires in Telegram but nothing reaches the session)
• With --debug: Explicitly shows:

``
--channels ignored (plugin:telegram@claude-plugins-official)
Channels are not currently available
``

• Debug log confirms: Channel notifications skipped: channels feature is not currently available

What I've Verified

• ✅ Admin toggle ON in claude.ai web console
• ✅ Plugin installed and MCP server connects (160ms, tools capability confirmed)
• ✅ Bot token valid (Telegram shows typing indicator = bot is connected)
• ✅ DISABLE_TELEMETRY is NOT set
• ✅ No managed-settings.json files are delivered to the client
• ❌ Server-side feature flag (tengu_harbor) appears to not be enabled for this Team account

Related Issues

• #36453 — Teams plan blocked
• #36460 — Max plan blocked, root cause analysis of feature flags
• #37071 — Teams plan, admin enabled, still blocked
• #36503 — Detailed eligibility gate analysis