Issue integrating Slack MCP only in the Deco.cx workspace

### Description We are facing issues when trying to integrate the **Slack MCP** specifically in the **Deco.cx** workspace. - In other workspaces, the integration works as expected. - When connecting the same agent to a different workspace, it also works fine. - However, in the **Deco.cx** workspace, the bot does not recognize messages and does not respond. It seems that the **`teamId` is being returned as empty**, as if the **OAuth flow** is not working correctly only for this workspace. <img width="589" height="958" alt="Image" src="https://github.com/user-attachments/assets/c7317def-b04d-4dff-a4f4-dc0a78ae3bb4" /> --- ### Steps to Reproduce 1. Connect Slack MCP to the **Deco.cx** workspace. 2. Try interacting with the bot. 3. Notice the bot does not respond. 4. Compare with the same integration in another workspace (works fine). --- ### Expected Behavior The bot should recognize and respond to messages in the Deco.cx workspace, just like it does in other workspaces. --- ### Actual Behavior - The `teamId` seems to be returned as empty. - The bot does not recognize any messages. - OAuth does not appear to complete correctly only in this workspace. --- ### Evidence - Test performed on **2025-09-19** (see attached screenshot). - The screenshot shows the agent working fine in another workspace. --- ### Environment - Test date: **2025-09-19** - Affected workspace: **Deco.cx** - Other workspaces: working as expected