Trello MCP: "Permissions are blocked for these workspaces" even though org admin allowed all MCP per

Question

Hi everyone,

I'm the organization admin of the Atlassian organization "img-design" and also an admin of the Trello workspace "ImageDesign".

I'm trying to authorize an AI tool (Muse) to connect to the official Trello MCP server (https://mcp.trello.com/v1). On the consent screen, when I select my workspace "ImageDesign", I get:

"Permissions are blocked for these workspaces. Contact your organization admin to request access or see how permissions are managed."

Following the official troubleshooting page, I checked Atlassian Administration (Atlassian MCP server settings):

•  Permissions tab: Read 16/16 allowed, Write 16/16 allowed — including read_trello and write_trello.

•  Domains tab: "Allow Atlassian-supported domains" is ON.

•  I'm the org admin myself, so there's no other admin to ask.

•  I retried the authorization on the next day as well; same result.

Is there anything else that can block a workspace even when all MCP permissions are allowed? For example, does the Trello workspace need to be connected to / owned by the organization in a specific way before Trello MCP authorization works?

Any advice would be appreciated. Thanks!

Gabriela - LeanZero · Answer

Hi 川崎 大裕,

The Trello MCP guide (https://support.atlassian.com/trello/docs/connect-trello-to-ai-assistants-with-trello-mcp/) lists this exact error. Its explanation is "Your admin has not allowed MCP permissions for that workspace or product access combination." A domain block shows a different message ("Access to this domain is restricted"), so I don't think the domain setting is what's stopping you here. Arek's test with another client should show whether it's tied to the client or to the workspace.

On ownership, the guide says a workspace your organization doesn't own may lose the Inbox and Planner permissions, and "You can still grant Read and Write permissions for that workspace's boards and cards." So ownership on its own shouldn't block you. The part I'd still check is scope. The guide says the MCP controls in Atlassian Administration are for "Enterprise organizations managed through admin.atlassian.com", so I'd confirm that ImageDesign really sits under the Trello Enterprise linked to img-design. The docs don't define "product access combination", but a workspace outside that Enterprise is my best guess for what it means here.

Arkadiusz Wroblewski · Answer

Hello

Could you also try connecting through Claude or ChatGPT to see whether the issue is specific to Muse?

Cheers,

Arek🤠🧙‍♂️