Copilot Studio agent works in M365 Copilot but silent in Teams personal chat (0 Studio sessions)

We are troubleshooting a Copilot Studio agent that works in Microsoft 365 Copilot and Studio test, but does not receive inbound activities from Microsoft Teams personal chat.

Environment

- Agent: Caflou Asistent v1.0.8

- Channels: Microsoft 365 Copilot + Microsoft Teams (published / synchronized)

- Agent Registry: Available

- Entra/bot appId: 7e4a53cc-f51c-4772-ad93-e3f1e8060f35

- Maker-provided tool connection works in Studio (example getTasks HTTP 200)

What works

1) Microsoft 365 Copilot agent chat / shareLink → agent replies; Studio sessions with channel "Microsoft 365 Copilot"

2) Copilot Studio test pane → agent responds

What fails

1) Teams personal chat (desktop AND web): user message visible in "Caflou Asistent" chat, no agent reply

2) Studio Monitor: Teams channel sessions = 0 for probes (only M365 Copilot sessions in last 7 days)

3) Teams Admin Center → Manage apps: 0 results for name "Caflou" and full appId (other apps searchable); UAM banner present while Registry shows Available

Classification

- Teams inbound activity not reaching Copilot Studio runtime

- Not OAuth / not MCP host / not publish alone (M365 path proves runtime alive)

- Secondary: Registry Available ≠ TAC Manage apps listing

Questions

1) Why would Teams 1:1 never create a Studio conversation while M365 Copilot does?

2) Is missing TAC Manage apps row expected under Unified App Management when Registry shows Available?

3) Best next diagnostic when Monitor shows 0 Teams sessions after confirmed client send?

Constraints: no Copilot Studio paid support plan; looking for field experience / known product issues. No secrets posted.