Persistent 'Error Adding Trello to Slack' After Full Reset

[Jonathan Hess]

**Details:**

I'm unable to link my Trello and Slack accounts. Every attempt fails with the same error page:

> Uh oh! There was an error adding Trello to Slack. Please try again in Trello.

I have three distinct error IDs from three separate attempts, confirming this isn't a one-off:
- `5dfdaaa4-44ec-48d9-a274-f9671e8c8b38`
- `a5fd7708-9353-44a1-ac8e-66654e897706`
- `836dfd24-2d0d-4d60-b80e-6c06236b846d`

**Steps already completed:**
1. Revoked the Trello Slack App token at trello.com/my/account → Applications → Revoke
2. Ran `/trello logout` then `/trello login` in Slack
3. Attempted re-authorization — same error
4. Retried in Chrome Incognito with no extensions — same error

**Environment:**
- Browser: Chrome (latest), Incognito mode
- OS: macOS
- Trello plan: Free
- Slack: installed and approved by workspace admin

The fact that each attempt generates a new unique error ID suggests the OAuth flow is initiating but failing on the backend, not a client-side issue. This is not resolved by the standard troubleshooting steps in the support docs.

Has anyone seen this resolved? Is there a known backend issue with the Slack auth flow currently?

[Jonathan Hess]

I was able to 'add' slack from the trello workspace but that still does not do the job. it shows up as connected in the trello workspace, and shows up as connected in the slackbot's 'message' tab, but does NOT show up in the slackbot's 'home' tab so any time i actually try to use it, it prompts me to log in again in the broken flow above ^.

I don't know why this is such a miss.